Shanghai Daoqin Plastics Co., Ltd.

polyester (pet)既 can for 苯二甲 acid ester (dmt) and ethylene glycol (eg) reaction made, can for 苯二甲 acid (pta) and ethylene glycol reaction made. currently, world 各国pet production using/adopting technology main/primary is this types, is dmt method (也称 ester method) and pta method (直接 ester method). 　　dmt method is using/adopting for 苯二甲 acid ester (dmt) and ethylene glycol (eg)进行 ester reaction, rear polycondensation formed is pet. pta method using/adopting high pure degree for 苯二甲 acid (pta) or in pure degree for 苯二甲 acid (mta) and ethylene glycol (eg)直接 ester 化, polycondensation formed polyester. this type of ester method is 自1965 year 阿莫科 company for coarse for 苯二甲 acid made obtain formed rear development 起, rear development speed, pet production 也随之 to very fast development. 　　 due to pta method relatively dmt method advantages more more (raw materials consumption low, eg recycling system relatively small, 不副产甲 alcohol, production relatively safety, process/workflow short, engineering investment low, use engineering consumption and production cost relatively low, reaction speed degree 平缓, production control comparison stability) and other, currently world pet总 production can force in large more using/adopting pta method. 　　20世纪60 year 代初, pet production 以间歇 method is 主. 60 year rear, 西欧各国, Japan USA rear, formed development 出 连续化 production technology, due to 连续化 process relatively method process excellent 越, output/production volume large, quality good, can 直接纺 filament, product cost low, therefore to speed development. currently already formed is pet production 主流. 70 year rear pet plant/unit, large using/adopting 连续化 process. 进入80 year rear, newly built pet plant/unit 即以pta method 连续化 is 主. another, pet industrial use filament and bottle use development, also pet solid versus polycondensation increase viscous technology, but also its process has and method separation. 　　pet resin has very more patent production technology, is ester and polycondensation process (熔 melt versus) also is production relatively high viscosity bottle use resin solid versus poly has very more different process. its in melt polymerization methods main/primary technology has company has company, Teijin company, kanebo company, ems-inventa company, john brown deutsche company, DuPont company and sunkyong company and other; solid versus polycondensation methods main/primary technology has company has company, bepex company, hosokawa company, 卡尔菲休 company, sinco company, buehler company and sunkyong company and other. （l）pta直接 ester process. if using/adopting pta is raw materials, pet polyester polymer production main/primary has below/following reaction: 第一步 is pta and eg进行 ester reaction, formed for 苯二甲 acid ester (bhet); 第二步 is bhet in catalytic agent function lower polycondensation reaction formed pet. ester reaction stage/phase, is shrink short reaction time, ester reaction reaction pressure need high large gas pressure, reaction temperature degree need high alcohol 沸点. specific reaction in use alcohol and tpa ratio is 1.1: 1-2: 1, reaction using/adopting temperature degree is 258-263℃. polycondensation reaction reaction temperature degree must high polymer temperature degree (260-265℃), low 于300℃(当 temperature degree to this value 时, polymer 开始出现 degradation), therefore polycondensation reaction most combined temperature degree scope/range is 275-290℃. polycondensation reaction reaction time less is 2 small 时, specific reaction device different has different. this reaction reaction relatively small, therefore in reaction process in also must fast remove reaction formed ethylene glycol, reaction balanced, make reaction toward right 进行, 否则不但会 effect/influence reaction speed degree, but also polymerization degree 也提不 high. therefore polycondensation requirements in true lower 进行, especially is polycondensation rear requirements in high true degree lower 进行, meanwhile amount increase surface. 　　一 used for ester reaction or ester reaction catalytic agent can used for polycondensation reaction. in more catalytic agent in, oxidation and acid is most commonly used types type, it in polycondensation reaction high temperature lower has 效(275-290℃), 并不受亚磷 acid type stabilizer effect/influence. this catalytic agent can ester reaction catalytic agent in reaction 初始时 add 入, can in ester reaction rear add reaction device in. （2）伊文达-费休 polyester reaction device technology. ems伊文达-费休(inventa-fisher) company development innovation polyester reaction device technology, can reduce production polyester Raw Materials consumption and improve/increase rate. this type of is espre reaction device can make 转化费 use reduce 26%, improve/increase sales 收益22% and polyester quality. reaction device can active used for pet, ptt, pen and pbt and its copolymer ester. in new process in, ester and polycondensation meanwhile in reduce pressure and temperature degree conditions lower 进行, has reaction. using/adopting reaction gas or inert property gas formed versus mixed combined, machine mixed combined, reaction system 自动进行. utilizing new reaction device reaction system, can generate material and reaction 死区, meanwhile can to optimization molecular weight distribution target/goal. currently, this type of new technology remove already has sleeve/set 1吨/ day in type plant/unit outer, also has sleeve/set polyester plant/unit using/adopting new reaction device technology, Germany 240吨/ day plant/unit positive in construction in, Netherlands 180吨/ day plant/unit 处于基础 engineering stage/phase, China Taiwan 120吨/ day plant/unit already using/adopting this type of reaction device. （3） polyester polymerization catalytic agent. currently world large more 数pet polyester production plant/unit still using/adopting type catalytic agent, catalytic agent use amount 约占90%, its it also has and titanium type catalytic agent, tube/pipe this type catalytic agent catalytic very good, 但随 人们认识 improve/increase, 锑 毒 property issues 愈 愈受 to 人们关注. therefore in recent years pet non catalytic agent research non active 跃. DuPont, 东洋纺, Teijin, 吉玛, acordis, synetix and other company launch 无锑无 heavy metal environmental protection type catalytic agent. pet non catalytic agent development 引人注目 has below/following 一: acordis company c-94 catalytic agent, company ecocat catalytic agent, 东洋纺绩 company new polyester catalytic agent, Teijin company new type titanium type polyester catalytic agent technology and other. 随 人 type for environmental protection and requirements improve/increase, this category of catalytic agent development will has vast outlook/prospects.