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2001 Vol.18 Issue.5,Published 2001-09-15
Article
Article
249 Study on Soap-Free Emulsion Polymerization of System St-BA-HEA in the Presence of Methanol
LIU Yu-jun 1, DUAN Jing-xing 2,YU Kai-yu 3
By means of soap free emulsion the polymer microspheres have been synthesized with styrene (St)、butyl acrylate(BA) and hydrophilic monomer(HEA) in the presence of methanol. The effects of the cosolvent methanol dosage, the initiator dosage and hydrophilic monomer dosage on the polymerization rate and the final latex particle diameter were studied. The results show that the polymerization rate speeds up, the final latex particle diameter and its monodispersity increase as long as the proper amount of methanol is added. The polymerization rate and the final latex particle diameter rise with increasing the initiator dosage and hydrophilic monomer dosage in the presence of methanol.
2001 Vol. 18 (5): 249-254 [Abstract] ( 3095 ) [HTML 0KB] [ PDF 0KB] ( 6 )
255 Analysis of the Deactivated Co-Mo-K/Al_2O_3 Sulfide Catalyst for WGSR
LI Yu-Min,WANG Li-Gang, WANG Ri-jie, ZHANG Ji-yan, CHANG Liu
Taking advantages of various characterizing techniques and comparative data between the activated and deactivated Co-Mo-K/Al 2O 3 sulfide catalysts for WGSR obtained some results. It was found that in the deactivated sample some K and S ingrated from interier to exterior and carried away by the gas stream, Al 2O 3 was changed from γ-Al 2O 3 to (Al 2O 3). 10R some more stable form of Co and Mo components were formed by the action of higher steam partial pressure resulting in the loss of reactivity seriously. Besides, Fe, Ni, and Co trapped by the feed gas from the pipe lines and vessels deposited on the surface the covering of the active sites, thus made the situation worse.
2001 Vol. 18 (5): 255-259 [Abstract] ( 1989 ) [HTML 0KB] [ PDF 0KB] ( 6 )
260 A Study of Sorbents for Chloride Removal from High Temperature Gas
DOU Bin-lin 1,CHENG Ran-zheng 2,ZHANG Zhi-de 1,GAO Jin-sheng 1,SHA Xing-zhong 1
Five sorbents for chloride removal from high temperature gas were studied in a fixed bed reactor. The experimental results show that all the tested sorbents can rapidly react with HCl vapor at 300℃,and reduce the HCl vapor concentration from about 1×10 -3 mg/m 3 to 0 5×10 -6 mg/m 3. The EC02 sorbent self prepared presents the highest chloride capacity. The effects of reaction temperature on chemical reactivity of EC02 sorbent and distribution of chloride in the sorbent bed were studied. It is found that the higher the reaction temperature, the higher the chloride content of sorbent and sorbent in the upstream end of the bed is nearly saturated with the chloride whereas sorbent in the downstream end contained less than 2% of chloride.
2001 Vol. 18 (5): 260-265 [Abstract] ( 1639 ) [HTML 0KB] [ PDF 0KB] ( 5 )
266 Study on the Synthesis of 2-Methylpyrazine(Ⅰ) ——Study on the Catalyst
ZHOU Li-shan,FENG Ya-qing,QU Hong-mei,SONG Hong-yu,SHI Da-xin
This paper studies a process of preparing 2\|methylpyrazine by vapor\|gas phase heterogeneous catalytic reation of ethylenediamine with propylene glycol. The effects of active components,the ratio of active components,carriers and calcined temperature,are investigated systematically. The effective and selective catalyst is prepared by impregnation of Zn\|Mn\|Cr nitrates on the charcoal with the ratio of 2∶2∶1 by weight. The catalyst is used at 360℃ and the yield is 86.7%.
2001 Vol. 18 (5): 266-268 [Abstract] ( 1908 ) [HTML 0KB] [ PDF 0KB] ( 6 )
269 The New Synthetic Route of HCFU
GU Feng-cai,SHI Yun-mei,WANG Yan-guang,WANG Jin-ming,NIE Jian-ming
In this paper the new synthetic route of HCFU was based on the Curtius rearrangement reaction,in which HCFU was prepared by two steps. Firstly,the n -hexyl isocyanate was prepared from ethyl heptanoate and hydrzine hydrate by Curtius condensation reaction. And then the title compound was synthesized from 5-FU by using pyridine as solvent,in which the mixture of 0.1mol 5-Fu and 0.1mol n -hexyl isocyanate in pyridine was heated 3h at 95℃ to give HCFU.
2001 Vol. 18 (5): 269-271 [Abstract] ( 1601 ) [HTML 0KB] [ PDF 0KB] ( 5 )
272 Biomimetic Synthesis Technology and Its Application Researches
WANG Yi-ping,ZHU Li,LI Wei,HU Tong-yu,LIAO Ming-Feng,JI Xiu-ling
Since the 1990s,a new synthesis method called biomimetic synthesis,which imitates the mechanism of biomineralization has emerged.In the process of bimineralization,the growth of inorganic materials were guided by the organic macromolecules.Materials produced with the new technology,such as nanometer particles\,thin films and porous materials always possessed special physical and chemical characteristics.The high-performance inorganic materials synthesized in the biomimetic ways have established the focus and fromtier position of biomimetic synthesis technology in the material chemistry field.
2001 Vol. 18 (5): 272-278 [Abstract] ( 1668 ) [HTML 0KB] [ PDF 0KB] ( 5 )
279 Degradaton and Recycle of Plastics
XU Min,YU Jiu-gao,JIAO Lei
Degradation and recycle of plastics have gained wide attention.In this paper,the recent progress of this topic is reviewed.It is the emphasis of this paper on that filled degradable plastics which is made from non\|natural polymer are stated.Concurrently,some methods of recycling plastics are introduced.
2001 Vol. 18 (5): 279-284 [Abstract] ( 1651 ) [HTML 0KB] [ PDF 0KB] ( 6 )
285 Synthesis of Esters of Taxotere Side Chain
LI Chun-bao,WANG Chao,LI Nan,ZHAO Chun-chang,ZHANG Wen-qin,ZHAO Li-ping
Eight Taxotere side chain esters (2-hydroxy-3-phenyl-3-(t\|butyloxycarbonyloxyamino)proponates)(D) were synthesized by opening of the ring of 3-ethoxyethoxy-4-phenyl-2-azetidinone (B)in the presence of alcohol and NaHMDS followed by deprotection with AcOH.These are all new compounds.Their structures were confirmed by IR,\+1HNMR and elementary analysis.)
2001 Vol. 18 (5): 285-289 [Abstract] ( 1569 ) [HTML 0KB] [ PDF 0KB] ( 6 )
290 Separation on the Aqueous Alcohol Solution by Extractive and Reactive Distillation with Salt
LEI Zhi-gang,ZHOU Rong-qi,YE Jian-qiang,WANG Hong-you,DUAN Zhan-ting
On the basis of extractive distillation with salt and extractive distillation with reaction,a new method of extractive distillation with salt and reaction combined was put forward in the paper.According to the experiments of isopropanol\|water system it showed that extractive distillation with salt and reaction combined was better than extractive distillation with salt only.Through the process experiment it further proved that this method got the product of isopropanol over 96% and was very effective for separating aqueous alcohol solutions.
2001 Vol. 18 (5): 290-294 [Abstract] ( 1798 ) [HTML 0KB] [ PDF 0KB] ( 6 )
295 The Pore Size and Pore Size Distribution on the Surface of Polyethersulfone Hollow Fiber Plasmapheresis Membrane
ZHAO Chang-sheng, CAI Zheng-wu, YUE Yi-lun
The pore size and its distribution on the surface of polyethersulfone (PES) hollow fiber plasmapheresis membrane were characterized by using microscopic observation method of field emission scanning electron microscope(FESEM) and solute transport model method based on particle separation.The geometric mean pore size is 229nm. The pore size is distribution ranged from 150nm～350nm,obtained by FESEM.The mean pore size is 197nm,which was obtained from solute sieving coefficients.The PES hollow fiber membrane with mean pore size about 200nm was suit for plasmapheresis.
2001 Vol. 18 (5): 295-299 [Abstract] ( 1784 ) [HTML 0KB] [ PDF 0KB] ( 5 )
300 A Model of Fixed Bed for Extracting Erythromycin with Porous Media Impregnated by Solvent
CAO Zheng-fang 1, YUE Qing-hua 2
The extraction technology using the porous media to be impregnated by solvent is an effective separation method.In this paper,based on the characteristic of the fixed bed solvent extraction,the diffusion mass transfer model was adopted.By supposing of inner diffusion controlling step,a mathematical model of fixed bed for extracting erythromycin from its fermentation liquid with porous media impregnated by solvent was carried out.
2001 Vol. 18 (5): 300-302 [Abstract] ( 1735 ) [HTML 0KB] [ PDF 0KB] ( 6 )
303 Synthesis of 2-Methyl Octanoic Acid
MENG Yi, CHEN Li-gong, GU Xian-feng, SONG Yun
In the study on the synthesis of sex pheromone of pine saw fly, the 2-Methyl octanoic acid, an important synthon block of the sex pheromone was synthesiszed in this paper. It was obtained from diethyl malonate in about 24 2% yield through hexylation, methylation, hydrolysis and decarboxylation.
2001 Vol. 18 (5): 303-307 [Abstract] ( 1632 ) [HTML 0KB] [ PDF 0KB] ( 6 )
308 The production Technical Transformation of Petroleum Resin
QUANG Pei-feng
In the production of petroleum resin, the technical transformation has made remarkable economical and social benefit. The technical transformation includes that change three steps polymerization to one step and the watering technology of removing BF\-3 to neutralization-filter technology.
2001 Vol. 18 (5): 308-311 [Abstract] ( 1587 ) [HTML 0KB] [ PDF 0KB] ( 5 )
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