关闭×
化学工业与工程
Home
|
|
About Journal
|
Editorial Board
|
Instruction
|
Subscriptions
|
Download
|
Publication Ethics
|
Contacts Us
|
Chinese
化学工业与工程
Office
Author Center
Peer Review
Editor Work
Office Work
Editor-in-chief
Journal
Current Issue
Next Issue
Archive
Advanced Search
Read Articles
Download Articles
Email Alert
Current Issue
2024 Vol.41 Issue.1,
Published 2024-01-15
0
2024 Vol. 41 (1): 0-0 [
Abstract
] (
362
) [
HTML
1KB] [
PDF
876KB] (
1643
)
1
Kinetics of the transesterification of methyl methacrylate and
n
-butanol with tetrabutyl titanate as catalyst
PENG Shiren, WANG Yan, CAI Wangfeng
Due to the problems such as the equipment corrosion and environmental pollution, the production process of butyl methacrylate is gradually replaced with the more environment-friendly transesterification process. In this paper, the reaction and mechanism of the synthesis of butyl methacrylate by transesterification of methyl methacrylate and
n
-butanol with tetrabutyl titanate as catalyst were initially investigated. Based on the Lewis acid catalysis theory, the mechanism of the reaction was proposed through the reasonable assumptions and simplifications, and the kinetic models based on idea solutions(IS) and non-ideal solutions(NIS) were established, respectively. Through the transesterification experiments, the effects of factors such as reaction temperature, initial molar ratio of reactants and the catalyst amount on the reaction rate were studied, and the model parameters of the kinetic model and the thermodynamic data were obtained from the regression of the experimental data. The results show that the transesterification reaction is an endothermic reversible reaction, the standard molar reaction enthalpy is 14.406 kJ·mol
-1
, and the activation energies of the forward and reverse reactions are 70.2 and 51.1 kJ·mol
-1
, respectively. The comparison between the calculated values and the experimental data demonstrates that the derived kinetic model is highly reliable and will provide some theoretical guidance for the synthesis of butyl methacrylate by transesterification of methyl methacrylate and
n
-butanol with tetrabutyl titanate catalyst.
Guide:
2024 Vol. 41 (1): 1-11 [
Abstract
] (
279
) [
HTML
1KB] [
PDF
2862KB] (
751
)
12
Preparation of pre-dispersed C.I. Pigment Orange 34 with core-shell structure
ZHANG Tianyong, WANG Yutong, LIU Wanxing, LI Bin, JIANG Shuang, LYU Dongjun
In the coloring process of traditional organic pigment masterbatch, the filter dispersion value of the masterbatch is relatively large, pigment dispersion needs to be improved, and the preparation process is complicated. Using 3,3'-dichlorobenzidine(DCB) and
p
-tolylpyrazolone as raw materials, a diazotization coupling reaction was carried out to obtain a mixture of C.I. Pigment Orange 34 (PO34) and water. 110-Type polyethylene wax (PE) was added under heating condition in order to combine the PO34 with the melted PE outer layer to yield the desired pre-dispersed PO34 (PPO34) with uniform morphology and good dispersibility. By changing mass ratio of PE and PO34, particle size of PE, heating time and heating temperature, stirring rate and other experimental conditions, the effects on the performance of the pigments were studied. The better condition obtained by comparing the morphology and coloring data is as follow: particle size of polyethylene wax 41—60 mesh, mass ratio of PE and PO34 1∶1, heating time 20 min, heating at 90 ℃, mechanical stirring rate 200 r·min
-1
. The pre-dispersed PO34 prepared under this condition has obvious core-shell structure and uniform particle size. Compared with original PO34, PPO34 exhibited better hydrophobic properties and lower water content, which resulted to a short filtration time. The preparation of PPO34 is more environmentally friendly and efficient, which avoid of the dust pollution from the traditional hard filtration cake pulverized process. Compared with the masterbatch addition process, PPO34 exhibited better dispersion performance. Under the premise of maintaining the pigment properties similar to the original pigment in shade, brightness, saturation, and color, the color strength of the pigment is enhanced, and the various properties of the pigment are also improved.
Guide:
2024 Vol. 41 (1): 12-20 [
Abstract
] (
231
) [
HTML
1KB] [
PDF
3087KB] (
698
)
21
Preparation and photocatalytic properties of 3D recyclable Bi
2
WO
6
/graphene aerogels
LEI Chao, CHANG Wei, ZHOU Yingying, LUO Jie, LI Yunfeng, LIU Bin
In order to improve the photocatalytic activity and recyclability of Bi
2
WO
6
, the Bi
2
WO
6
/graphene aerogel (BGA) with 3D structure were prepared by hydrothermal self-assembly method. The prepared samples were characterized by XRD, SEM, FT-IR, UV-Vis DRS, BET, etc. The photocatalytic performance of the prepared samples was evaluated using rhodamine B (RhB) as the target pollutant and 500 W xenon lamp as the light source. When the mass ratio of Bi
2
WO
6
to GA was 6∶1, the degradation rate of rhodamine B by photocatalytic degradation could reach 99.7% within 120 min. After 5 cycles of use, the Bi
2
WO
6
/graphene aerogel composite still maintains good stability. The degradation rate of tetracycline hydrochloride was 98.6%. Free radical trapping experiments confirm that h
+
is the main active species during the photocatalytic process. In addition, the BGA has certain deformable and compressive ability, which improves the recycling and reusability of the material.
Guide:
2024 Vol. 41 (1): 21-27 [
Abstract
] (
282
) [
HTML
1KB] [
PDF
5295KB] (
656
)
28
Progress in preparation and application of singlet oxygen
CAO Cuiping, SHI Peng, ZHENG Bo, ZHU Zhenxing
Singlet oxygen (
1
O
2
) is one of reactive oxygen species (ROS), which is excited by molecular triplet oxygen and has good oxidation activity. Compared with other ROS,
1
O
2
has better selectivity and higher activity, so it has greater research value. Since its discovery, people have gradually realized its important role in organic synthesis.
1
O
2
research has promoted the wave of scientific development in the fields of organic chemistry, biochemistry, medicine, environmental chemistry, and food chemistry. This article reviewed the basic properties of
1
O
2
, reviewed the preparation methods of
1
O
2
including photosensitization and chemical methods, as well as key scientific research on the reaction with organic substances, and further evaluated its application value to organic synthesis. High industrial value alcohols, epoxy compounds and carbonyl compounds provide a variety of synthetic reaction pathways, and are effective active components for loading oxygen on organic matter. We hope this article will inspire researchers in related fields to promote the development of the field of organic synthesis.
Guide:
2024 Vol. 41 (1): 28-39 [
Abstract
] (
223
) [
HTML
1KB] [
PDF
1523KB] (
1292
)
40
Preparation of ellagic acid from Tara Tannin oxidation by liquid-air jet
LI Ruijun, XU Juan, ZHANG Hong, LIU Lanxiang, MA Jinju, ZHANG Jiayan
In order to solve the problem of scarce raw materials of gallnut tannin, Tara powder was used as raw material to prepare ellagic acid and liquid-air jet technology was used to oxidize Tara Tannin solution. The purification process of ellagic acid was explored. Samples were detected and analyzed by high performance liquid chromatograph, ultraviolet visible spectrophotometer, Fourier transform infrared spectrometer, and synchronous thermal analyzer. The results show that, the better technological conditions for the preparation of ellagic acid from Tara powder are: Tara Tannin solution is obtained by water extraction, the Tara Tannin concentration is 30 g·L
-1
, the pH of the reaction solution is adjusted with 12% NaOH to be 8.5, the reaction temperature is 30 ℃, the reaction time is 6 h. Under this condition, the yield and mass fraction of ellagic acid were 44.58% and 88.69% after alkali soluble acid precipitation. Solvent washing method was used to purify ellagic acid samples after alkali dissolution and acid precipitation. At this time, the yield of ellagic acid was 61.70% and with a mass fraction of 94.69%. The preparation method greatly shortens the reaction time and has a high mass fraction.
Guide:
2024 Vol. 41 (1): 40-46 [
Abstract
] (
232
) [
HTML
1KB] [
PDF
2182KB] (
546
)
47
Research progress in hydrogen purification technology
LI Wenbin, WU Yazhou, ZHENG Hao, JIANG Xiaofeng, ZENG Liang
Hydrogen purification technology is an essential part of the efficient use of hydrogen energy by removing impurities from hydrogen-containing raw gases, and various methods have been developed to obtain high purity H
2
for different industrial needs. Based on the purification principle, H
2
purification methods can be divided into physical methods such as pressure swing adsorption, membrane separation, cryogenic distillation methods, and chemical methods such as CO preferential oxidation, CO selective methanation and metal hydride separation methods. The technical principles and research progress of the different purification methods are reviewed in this paper. The choice of H
2
purification process should be based on the composition of the raw gases, the requirements of the product gas and the specific scale of purification. The combination of different processes, the development of advanced materials as well as novel process intensification technologies are needed for future research.
Guide:
2024 Vol. 41 (1): 47-70 [
Abstract
] (
208
) [
HTML
1KB] [
PDF
2430KB] (
902
)
71
Research progress on ion transport mechanism in solid-state electrolytes
DIAO Qingyu, LIU Jiyuan, WANG Lie, LI Chuanwei, LIU Xingjiang, XU Qiang
All-solid-state lithium metal batteries have strong safety and stability, are an ideal selection to replace traditional lithium-ion batteries as next-generation energy storage devices. However, compared with liquid electrolytes, solid-state electrolytes have low ionic conductivity, which is still a key impediment to the rapid development of all-solid-state lithium metal batteries. This paper reviews the ion transport mechanisms of different types of solid electrolytes, summarizes the improvement strategies and the latest research progress in enhancing the conductivity of solid electrolytes, and concludes the technical routes to improve the ion transport performance of solid electrolytes, making an outlook to the design and development of new types of solid electrolytes in the future.
Guide:
2024 Vol. 41 (1): 71-82 [
Abstract
] (
261
) [
HTML
1KB] [
PDF
3852KB] (
946
)
83
Preparation of superhydrophilic oil/water separation membranes from dopamine modified waste masks
HAN Yaxin, NING Lianchao, LI Qunxing, HAN Yuxuan, FU Pengpeng, CHEN Xiangyu, LI Shuo, ZHANG Ming
The disposal of waste masks has become a new challenge due to the spread of COVID-19. In this work, the superhydrophilic membrane with excellent oil/water separation performance was prepared by in situ deposition of SiO
2
nanoparticles and grafting dopamine (DA) on the surface of waste masks. The modified waste-mask membrane exhibits good properties with water contact angle of 0°, the water flux of 6 953 L·m
-2
·h
-1
under gravity and the oil/water separation efficiency of 98.65%. The modified membrane maintains a good stable performance in acidic and alkaline solutions (pH=2—14). This work provides a new and economic way for the disposal and recycle of waste masks.
Guide:
2024 Vol. 41 (1): 83-89 [
Abstract
] (
234
) [
HTML
1KB] [
PDF
8890KB] (
757
)
90
A review of the viscosity of carbon dioxide expanded liquids in enhanced oil recovery
FANG Yuan, GAO Yahui, GONG Yanling, XIA Shuqian
The global warming issue caused by the greenhouse effect has attracted much attention over the past few years. Carbon dioxide (CO
2
) is considered the most important greenhouse gas. China has committed to the international community to reach carbon peaking and carbon neutrality goals. The CO
2
-EOR (CO
2
enhanced oil recovery) technology can not only reduce CO
2
emissions, but also expand the crude oil, reduce the viscosity of the crude oil, and enhance the fluidity of the crude oil to improve the oil recovery efficiency. Therefore, a full understanding of the transfer characteristics of CO
2
-expanded liquids (CXLs) is very important for the utilization of CO
2
-EOR technology. This paper provides a literature review of the research on the viscosity of carbon dioxide expanded liquids systems, including the experiment equipment, experimental data, and calculation models. The non-contact viscosity measurement methods such as surface light scattering have recently attracted more attention. And, there were many available experimental data for the CO
2
-
n
-decane and CO
2
-
n
-tetradecane binary systems while few data for CO
2
-
n
-alkane multi-system, CO
2
-cycloalkane, CO
2
-aromatic hydrocarbon, and CO
2
-cosolvent systems. This paper also describes the use of Eyring’s absolute reaction theory for calculating the viscosity of CXLs.
Guide:
2024 Vol. 41 (1): 90-102 [
Abstract
] (
269
) [
HTML
1KB] [
PDF
2985KB] (
517
)
103
Deashing technology of high purity polypropylene for electrical film
ZHOU Changhao, XING Zhaoliang, JIANG Tao, LI Jian
It is of great significance for China’s BOPP film industry and even the whole power capacitor industry to develop the ultra-low ash polypropylene material and break through the "Strangle" technology abroad. In this study, a "hexane+ethyl acetoacetate" two-component composite washing solvent system was designed, and the polypropylene resin with low ash content was subjected to deep washing and deashing treatment, the content of Ti, Mg and Al in PP was further reduced, and the ash removal rate of PP powder was over 70%, which was lower than 20 μg·g
-1
. The influence of detergent types, washing time, washing temperature and washing ratio were studied, and the physical and chemical properties and electrical properties of polypropylene were characterized. The results showed that the film breakdown strength increased from 562.3 to 632.8 kV·mm
-1
and the conductivity decreased from 2.0×10
-11
to 1.0×10
-11
S·m
-1
before and after washing.
Guide:
2024 Vol. 41 (1): 103-110 [
Abstract
] (
254
) [
HTML
1KB] [
PDF
2006KB] (
657
)
111
Mathematical modeling of CH
4
elimination for BGL gasifier
ZHANG Quancong, XUE Kang, CAO Zhikai, ZHOU Hua
BGL gasification technology is promising in the nitrogen fertilizer industry. However, the syngas containing excessive CH
4
produced by the BGL gasification cannot satisfy the demand for the synthetic ammonia process. In this work, a second nozzle was set in the BGL gasifier to eliminate CH
4
via secondary combustion. Then, the effect of secondary combustion was analyzed based on the proposed BGL gasifier model. It was found that the CH
4
concentration was less than 1% and the char conversion was higher than 99% when the gasifying agent of the second nozzle was 25% of that of the first nozzle. The syngas with high H/C used for the synthetic ammonia process can be produced by increasing the steam proportion in the first nozzle.
Guide:
2024 Vol. 41 (1): 111-117 [
Abstract
] (
259
) [
HTML
1KB] [
PDF
3161KB] (
493
)
118
Development of chemical process optimization system based on Python
WEI Xiaotong, YUE Jincai, YANG Anming, ZHOU Dongjian, ZHENG Shiqing
As a general chemical process simulation system, Aspen Plus has been widely used in simulation, design and optimization of chemical processes. As the need for complex process optimization increases, Aspen Plus’s built-in sensitivity analysis is no longer sufficient. Therefore, it is necessary to integrate Aspen Plus with optimization algorithms for solving complex optimization problems. In the Python environment, the control and data transmission of the Aspen Plus process simulation are realized, and a process optimization system is developed on this basis, which can easily integrate various optimization algorithms to solve optimization problems with different characteristics. Using theunivariate search technique to optimize the double-column variable pressure distillation of methanol-acetone azeotropic system with the annual total cost as the target function, the optimization of different variables and different sequences is flexibly realized, and the expected effects are achieved and the process development efficiency is improved.
Guide:
2024 Vol. 41 (1): 118-124 [
Abstract
] (
233
) [
HTML
1KB] [
PDF
2737KB] (
816
)
125
Optimization of contraction-expansion partition in a two-stage internal airlift loop reactor
LU Zhe, SHI Jiazhen, GUO Kai, LIU Chunjiang, ZHENG Longyun
Loop reactors are widely applied in industries because of good characteristics of gas-liquid interaction, and a series of internals are developed and equipped with the reactor to further reinforce the interaction. The installation of a contraction-expansion partition between two stages in a two-stage airlift loop reactor can effectively reduce the reversed liquid flow between the stages, while it increases the flow resistance. To pinpoint the effect of width and height of the partition on flow dynamics and obtain the partition which can reduce the flow resistance while decrease the reversed liquid flow, this study conducts an optimization of the partition utilizing CFD-PBM and multi-objective optimization methods. Firstly, a series of numerical simulation-based experiments with various partitions at three different superficial gas velocities are conducted to obtain the pressure drop and the reversed liquid flow in the two-stage loop reactor. It is found that the width and height of the partition as well as superficial gas velocities lead to different performance of flow dynamics. The width has a greater effect on pressure drop than the height at a low superficial gas velocity, while the effect of height on the pressure drop becomes larger as the superficial gas velocity increases and width is the determinant factor for the reversed liquid flow at all superficial gas velocities in the study. The correlations for pressure drop and the reversed liquid flow with the width and height of the partition are obtained by data fitting. The Pareto fronts for the structure of partition at various superficial gas velocities are obtained using multi-objective optimization with the pressure drop and the reversed liquid flow as the optimization objectives and the width and height of the partition as optimization parameters.
Guide:
2024 Vol. 41 (1): 125-135 [
Abstract
] (
223
) [
HTML
1KB] [
PDF
3891KB] (
721
)
136
Influence of the form of coalescers on the oil content of the oil outlet of tubular oil-water separator
LI Quan, LIN Ruting, WANG Zongyong, WANG Chao
In order to compare the effect of different coalescer on the oil content of the oil outlet of tubular oil-water separator, provide technical support for engineering design and selection, the concentration field and the oil content of the oil outlet of four different coalescers of the positive V-shaped inclined plate, the inverted V-shaped inclined plate, the traditional inclined plate and the snake-shaped back folding plate were analyzed by CFD method, the best structural parameters of the positive V-shaped coalescer in a single condition were investigated. Results show that in flow rate under study (0.05—0.35 m·s
-1
), the positive V-shaped component has the best the oil content of the oil outlet among the four kinds of coalescer, the snake-shaped back folding plate and the inverted V-shaped inclined plate ranked second and third, respectively, the traditional inclined plate separation has the lowest effect; With the increase of inlet flow rate, the oil content of the oil outlet of four kinds of coalescers decreases correspondingly, the traditional inclined plate drop the fastest, the positive V-shaped inclined plate and the snake-shaped back folding plate have slowest decline, have little difference, while the inverted V-shaped inclined plate decrease speed is in the middle, the control variable method is used to determine that the oil content of the oil outlet is the highest when the distance between the positive V-shaped component and the wall is
C
=10 mm and the horizontal angle
θ
=60°.
Guide:
2024 Vol. 41 (1): 136-143 [
Abstract
] (
200
) [
HTML
1KB] [
PDF
2450KB] (
753
)
144
Study on the effect of draft tube structure on mass transfer performance of airlift loop reactor
LI Liang, HAO Runqiu, HAO Yachao, SHI Xiaoguang, ZHANG Chengkai
The airlift loop reactor is widely used in chemical industry, environment and other fields. It is important to study the gas-liquid two-phase flow behavior in the airlift loop reactor to improve its mass transfer performance. In this study, the gas-liquid two-phase flow model and bubble population balance model were developed to investigate the effects of a single square draft tube, a single circular draft tube and six circular draft tubes on the gas-liquid two-phase flow characteristics, bubble size distribution and gas-liquid mass transfer. The results show that the airlift loop reactor with six circular draft tubes has larger average gas holdup and smaller bubble size, thus providing improved mass transfer rate. The relevant simulation results are useful for the structural optimization and scale-up of the airlift loop reactor.
Guide:
2024 Vol. 41 (1): 144-150 [
Abstract
] (
247
) [
HTML
1KB] [
PDF
4194KB] (
551
)
News
More
·
《化学工业与工程》入编2020年版《中文核心期刊要目总览》
·
·
《化学工业与工程》创刊30周年庆
·
·
2012年第4期目录
·
2012年第3期目录
·
·
Links
More
·
www.ccs.ac.cn
·
www.tju.edu.cn
Copyright ©2020 Chemical Industry and Engineering, all rights reserved.
Tianjin University 50A305, No.135 Yaguan Road, Haihe Education Park, Tianjin 300350, China
Tel: 86-22-27406054; E-mail:
hgbjb@tju.edu.cn
Support by
Beijing Magtech Co.Ltd
, E-mail:
support@magtech.com.cn
