Shanghai Daoqin Plastics Co., Ltd.

EPTA production technology and process/workflow analysis in recent years, EPTA production technology in and and other mono 位国家推广 application. due to use technology production for 苯二甲 acid product can full substitute/replace PTA（PureTerephthalicAcid） product, 因而引起 full many related injection molding parts processing 厂 广泛关注. 　　EPTA production technology （ also polyester grade for 苯二甲 acid production technology ）由 USA 伊斯曼 chemical company (Eastman) development, company 名称 第一 字母E and PTA组 combined 一起而命名. EPTA product upper is types for 苯二甲 acid product, is it in product quality indicators and production technology and PTA has 一定 差异. versus ratio 而言, EPTA product 含杂质 relatively more, pure degree low; 而PTA product 含杂质 relatively less, pure degree relatively high. however, this types product use property can usually has large difference, can used for fiber grade, non grade polyester （PET） combined formed, made polyester can make used for short fiber, micro fine fiber, di separation fiber, packaging container, film and other products production. 　　伊斯曼 chemical company development EPTA production technology main/primary oxidation mono 元, coarse for 苯二甲 acid （CTA） separation mono 元, rear oxidation mono 元, EPTA separation mono and catalytic agent recycling mono large separation formed. its production process/workflow usually is 以PX is raw materials, acid and acid is catalytic agent, bromine material is catalytic agent, in acid solvent agent in 通入空 gas oxidation reaction, make its formed CTA, rear again through rear oxidation reaction and crystallization process, remove CTA in 杂质, 如4-羧基苯甲 aldehyde （4-CBA） and for 甲基苯甲 acid （PT acid ）, most rear again separation and drying made EPTA product. 　　EPTA main/primary production usually oxidation and water 工序, separation and 洗涤工序, and rear oxidation, crystallization, and drying and other, lower for its main/primary production 工序进行 introduction. 　　(1) oxidation and water 工序 　　该工序 function is will for 二甲苯（PX） in acid solvent liquid in oxidation formed TA, production mono has catalytic agent 调配, oxidation reaction and solvent agent recycling, gas pressure shrink and gas catalytic 焚烧净化. 　　 catalytic agent 调配: catalytic agent (醋 acid 钴, acid 锰) solvent liquid 经调配 and HBr一起 add control liquid in, through high, low liquid and 洗涤醋 acid add amount catalytic agent concentrated degree adjustment. 　　 oxidation reaction: catalytic agent solvent liquid and for 二甲苯（PX）经静态 mixed combined rear add oxidation reaction device, pressure shrink gas reaction device lower distribution device, through 鼓泡代替搅拌进行传质传 hot. oxidation reaction in 155"165℃, 0.56MPaG conditions lower 进行, time "1 small 时, reaction formed TA in reaction device in 析出. 　　 oxidation reaction is strong/high hot reaction, is 维持绝 hot as, through acid solvent agent 汽化 移出 hot amount. reaction device 顶部出 gas solvent agent and reaction waste gas solvent agent water 塔, material material cold remove water and low material, injection molding parts processing inner water system. 不凝尾 gas gas system, material material 进离心 separation system 处理. 　　空 gas pressure shrink and gas 焚烧净化: water 塔顶部蒸汽 cold rear gas water separation 离, cold liquid oxidation reaction device, 不凝尾 gas separation drying pressure shrink rear used for rear material material 风送, other separation 先经膨胀透平 recycling can amount used for 驱动空 pressure machine, recycling can amount rear gas and system remove rear gas mixed combined 进入焚烧室, remove CO and has machine material, 燃烧尾 gas again 经文丘里急 cold device and alkali alkali rear large gas. 　　(2)离心 separation and 洗涤工序 　　该工序 function is will oxidation reaction device 塔底产 material in CTA, catalytic agent and separation 离, main/primary production mono has separation 离, 闪蒸, 残渣处理 system and other. 　　 oxidation reaction device material material 经离心 to material 罐泵送入卧式 pressure separation machine, will has PT acid, 4-CBA and other oxidation in material liquid and CTA滤饼 separation 离. machine liquid 经闪蒸 cold 凝, acid liquid oxidation reaction device material; 经闪蒸 concentrated shrink high liquid, large separation 直接进 catalytic agent system, separation 送入烛芯 滤 system remove solid 体残渣, liquid concentrated shrink, HAC cold liquid oxidation reaction system, 而蒸发残 liquid again rear 入共沸精馏塔, separation recycling has machine material, generate catalytic agent 污泥. in process in, through 共沸精馏 separation 离杂质, anti 止 副产 material and other 杂质 积累, ensure system stability 运行. in addition, in production process in generate a small amount of gas full 部接入烛芯 滤 system gas 洗涤塔进行处理. 　　(3) rear oxidation, crystallization, and drying 工序 　　该工序 function is will CTA滤饼 in 残存 4-CBA进一步 oxidation formed TA, rear 进一步 滤 and drying to formed product, main/primary production mono 元包括 rear oxidation, crystallization, and drying and other. 　　 rear oxidation: will CTA滤饼 use solvent agent recycling 塔釜送 HAC进行 again 打浆, rear will process pressure machine 输送出 pressure shrink gas through increase pressure pressure shrink machine add pressure to 1.7MPa, and material 一起送入二 串联 rear oxidation reaction device, reaction temperature degree through add 入HAC蒸汽 amount control. rear oxidation reaction device through pressure control will gas 体排入 solvent agent recycling plant/unit water 塔, oxidation rear material material 直接进 crystallization device. 　　 crystallization: rear oxidation reaction 出 浆 material 流出进入 belt/tape has 连续搅拌 device crystallization device 组, grade decrease pressure solvent liquid in acid 闪蒸出. 闪蒸出 醋 acid 蒸汽经 cold cooling, in cold device housing/shell generate low pressure 蒸汽, cold acid liquid 则返回 oxidation reaction device material, 不凝尾 gas catalytic device 处理. crystallization device 出 浆 material 进入闪蒸 product 罐进一步闪蒸 cooling rear, use to true 空转鼓 滤 machine. 　　 滤: true 空转鼓 滤 machine true liquid ring true system （包括 cold device, cooling device, separation device ） provide, liquid 接受槽 in low liquid use to oxidation 工序钴 control 调配槽, wet 滤饼经醋 acid rear through 斜溜槽进入 drying machine, true system gas cold liquid oxidation reaction system, 不凝尾 gas 送两段式洗涤塔（ lower use HAC洗涤 rear oxidation reaction system, upper water rear 排放）洗涤 rear 排放. 　　 drying: drying machine is 豪猪式, inner 通蒸汽 make HAC from in 蒸发, drying rear EPTA powder gas 流输送 to material 仓. system inner negative pressure, drying process generate waste gas true system 处理.