Crotonic acid(lub npe hu ua CA hauv qab no) yog cov khoom siv tshuaj lom neeg tseem ceeb thiab tau siv dav hauv cov tshuaj zoo, tshuaj thiab lub zog. Nws cov ntawv thov tseem ceeb yog raws li hauv qab no:
1. Copolymerization
Cov polymer feem ntau ntawm crotonic acid yog CA -vinyl acetate polymerized nyob rau hauv ib qho kev faib ua feem. Vim tias qhov kub zoo ntawm CA-vinyl acetate copolymer, kev npaj cov nplaum kub yaj yog ib qho tseem ceeb ntawm kev siv CA copolymer, xws li iav adhesion promoters, txheej aggregates rau pob zeb thiab ntawv Adhesives rau cov khoom, thiab lwm yam. CA-vinyl acetate yuav tsim cov dej-soluble resin tom qab neutralization, uas muaj cov yam ntxwv ntawm kev teeb tsa, thickening thiab brightening, thiab yog dav siv nyob rau hauv cov tshuaj pleev ib ce (xws li ntsia thawv polish, plaub hau styling tus neeg saib xyuas, plaub hau brightening agent, thiab lwm yam). CA copolymer kuj tseem siv tau los ua cov khoom siv tseem ceeb rau cov tshuaj zoo xws li dispersant thiab roj hmab. Hauv kev lag luam kws tshuaj, cov tshuaj tau tsim los ntawm CAs-vinyl acetate yuav tsim cov gel thaum nws ntsib dej, uas tuaj yeem ua rau qeeb qeeb ntawm kev tso tawm ntawm cov tshuaj thaum siv cov tshuaj, thiab tseem tuaj yeem txo qee cov tshuaj stimulant uas txhawb nqa lub hauv paus. paj hlwb. ntawm kev tsim txom. Ib yam li ntawd, kev sib xyaw CA-acrylamide copolymer nrog agrochemicals tuaj yeem tsim cov hydrogel uas muaj peev xwm ua kom qeeb cov tshuaj agrochemicals. Hauv lwm qhov chaw xws li lub zog, cov khoom lag luam polymerization ntawm crotonate thiab styrene yog cov khoom siv hluav taws xob zoo rau kev ntxhov siab, uas tuaj yeem txhim kho qhov kub thiab txias fluidity ntawm diesel, nce cov zis ntawm diesel thiab cov txiaj ntsig ntawm refining, thiab yog ib qho kev siv ntau ntxiv hauv diesel ntau lawm.
2. Derivation
CA tuaj yeem npaj tau los ntawm kev ntxiv, oxidation, hloov pauv thiab lwm yam kev cuam tshuam los npaj ntau yam CA derivatives, xws li crotonamide, 3-aminobutyric acid, crotonic anhydride, crotonyl chloride thiab crotonate. Crotonamide thiab isoxazole derivatives muaj anti-inflammatory, immunosuppressive thiab anti-proliferative teebmeem. Lawv tuaj yeem siv los ua cov tshuaj antigens rau kev npaj cov tshuaj tiv thaiv kab mob, thiab ua cov tshuaj tiv thaiv rau radioimmunoassay. Lawv tau siv dav hauv kev lag luam kws tshuaj thiab kev kuaj mob. kawm. Crotonic anhydride yog ib qho tseem ceeb ntawm cov organic chemical raw khoom, xws li anti-corrosion xim synthesized los ntawm crotonic anhydride, triglyme, thiab lwm yam. Nws muaj qhov zoo ntawm kub tsis kam, acid thiab alkali corrosion kuj thiab lwm yam. Tsis tas li ntawd, 3-aminobutyric acid tau los ntawm kev sib ntxiv ntawm carbon-carbon ob daim ntawv cog lus ntawm CA muaj cov kab mob ntawm cov nroj tsuag thiab tuaj yeem siv los ua cov nroj tsuag attractant thiab zaub preservative los tiv thaiv kab mob thiab kab mob los ntawm kev kis cov nroj tsuag lossis zaub, thiab lwm yam. . Siv dav hauv kev ua liaj ua teb thiab zaub mov. Raws li kev ua liaj ua teb muaj kev txhawj xeeb, crotonyl chloride yog ib qho tseem ceeb hauv nruab nrab ntawm acaricidal fungicide dinitrocrotonate. Nws yog tsuas yog siv rau sterilizing qoob loo thiab acaricides, thiab kuj yuav tov nrog lwm yam acaricides. Raws li kev soj ntsuam cov tshuaj muaj kev txhawj xeeb, methyl 3-aminocrotonate yog ib qho nruab nrab hauv kev sib xyaw ntawm cov tshuaj dipine (xws li felodipine, nifedipine, thiab lwm yam). Dipines tuaj yeem siv los kho cov kab mob plawv xws li angina pectoris thiab kub siab, thiab tseem muaj qee yam kev kho mob ntawm qee yam kab mob uas tsis yog kab mob plawv, xws li mob siab cirrhosis thiab bronchial hawb pob.
3. Cov tshuaj tiv thaiv deoxygenation
In recent years, preliminary research has also been carried out at home and abroad in the preparation of energy fuel and propylene by deoxygenation of CA. Researchers found that PHB pyrolysis product propylene is formed by decarboxylation of PHB monomer CA at high temperature (>400 degree). Propylene yog ib qho tseem ceeb raw khoom rau kev tsim peb cov khoom siv hluavtaws, xws li polypropylene, acrylic acid, thiab acrylonitrile. Tom qab ntawd, CA tau pyrolyzed nrog cov txheej txheem catalytic sib txawv, thiab nws tau pom tias cov khoom ntawm CA pyrolysis muaj kua roj ntxiv rau propylene thiab carbon dioxide. Ntawm lawv, dodeca triruthenium muaj kev ua haujlwm zoo catalytic rau decarboxylation cov tshuaj tiv thaiv ntawm unsaturated carboxylic acid, thiab muaj kev ua haujlwm zoo catalytic thiab xaiv rau CA los tsim propylene, thiab cov qoob loo tuaj yeem ncav cuag 22.9%. Tsis tas li ntawd, kua phosphoric acid (100%) muaj kev ua haujlwm zoo catalytic rau cov khoom siv roj npaj los ntawm CA, tab sis kua phosphoric acid muaj cov concentration siab, muaj zog corrosiveness, thiab nyuaj rau rov ua dua. Khoom phosphoric acid los yog phosphates (xws li txhuas dihydrogen phosphate) yog ib qho kev xaiv zoo los hloov cov phosphoric acid catalysts siab. Cov tshuaj tiv thaiv catalytic muaj cov yam ntxwv hauv qab no:
a. Cov tshuaj tiv thaiv kub yog nruab nrab (165 ~ 240 degree);
b. Cov txheej txheem tshuaj tiv thaiv yog yooj yim thiab tsis xav tau hydrogenation;
c. Cov catalyst tuaj yeem rov siv dua. Txawm li cas los xij, xws li cov khoom siv phosphoric acid-based catalysts tseem muaj qhov tsis zoo xws li muaj zog corrosiveness, tsis zoo thermal stability, thiab yooj yim ib puag ncig muaj kuab paug. Piv nrog rau cov phosphoric acid-based catalysts, cerium oxide yog ib qho catalyst nrog thermal stability, tsis muaj kua qaub thiab tsis muaj tshuaj lom. Cerium oxide muaj cov nyhuv catalytic zoo ntawm cov tshuaj tiv thaiv ketonization ntawm carboxylic acid, thiab tuaj yeem ua rau cov tshuaj tiv thaiv ketonization thiab deacidification ntawm CA, yog li npaj cov kua roj thiab propylene. Txij li thaum CA yog ib qho tseem ceeb ntawm cov khoom nruab nrab rau kev tsim cov tshuaj siv hluav taws xob los ntawm pyrolysis ntawm cov kab mob txuas ntxiv mus PHB, yuav ua li cas siv CA rau cov tshuaj tiv thaiv catalytic deoxygenation heev los npaj cov roj ua kua yog lub ntsiab lus tsim nyog ntawm kev kawm tob. Nyob rau yav tom ntej, crotonic acid yuav tsum tau siv dav hauv thaj chaw ntsuab.
Mia
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