公开(公告)号：USD326714S

公开(公告)日：1992-06-02

申请号：US451726

申请日：1989-12-15

申请人： Nobuyuki Funakoshi ,  Tsuruo Hatori ,  Nobuaki Akui ,  Tohru Shimizu ,  Masahiro Kawashima

设计人： Nobuyuki Funakoshi ,  Tsuruo Hatori ,  Nobuaki Akui ,  Tohru Shimizu ,  Masahiro Kawashima

公开(公告)号：US07173150B2

公开(公告)日：2007-02-06

申请号：US10424042

申请日：2003-04-24

申请人： Jinichi Yazaki ,  Kozaburo Sakano ,  Nobuyuki Funakoshi ,  Kazuho Tanaka

发明人： Jinichi Yazaki ,  Kozaburo Sakano ,  Nobuyuki Funakoshi ,  Kazuho Tanaka

IPC分类号： C07C51/09

CPC分类号： C07C51/43 ,  C07C51/09 ,  C07C51/412 ,  C07C51/47 ,  C08J11/24 ,  C08J2367/02 ,  Y02W30/706 ,  C07C63/28 ,  C07C63/26

摘要： This invention provides a process a process for recovering terephthalic acid from pulverized products of spent polyethylene terephthalate. This process comprises (1) a decomposition reaction step where the pulverized products of spent polyethylene terephthalate are continuously subjected to decomposition reaction in ethylene glycol in the presence of alkali, which is equimolar or excessmolar relative to the polyethylene terephthalate, so that salt of terephthalic acid and ethylene glycol can be continuously obtained; (2) a solid-liquid separation, dissolution, impurities-removing step where the ethylene glycol is separated from decomposition reaction slurry of salt of terephthalic acid and ethylene glycol, and the solid salt of terephthalic acid is dissolved into water, while insoluble impurities are removed; (3) a neutralization, crystallization step, where solution of said salt of terephthalic acid is neutralized with acid so that terephthalic acid can be crystallized; (4) a solid-liquid separation, washing stop where slurry of terephthalic acid crystals is subjected to solid-liquid separation so that the terephthalic acid crystals can be obtained and washed; and (5) a drying, pulverization step where the washed terephthalic acid crystals are dried and pulverized.

摘要翻译： 本发明提供一种从废聚对苯二甲酸乙二醇酯的粉碎产物中回收对苯二甲酸的方法。 该方法包括：（1）分解反应步骤，其中废聚对苯二甲酸乙二醇酯的粉碎产物在相对于聚对苯二甲酸乙二醇酯等摩尔或过量的碱的存在下在乙二醇中连续进行分解反应，使得对苯二甲酸的盐 可连续获得乙二醇; （2）从对苯二甲酸和乙二醇盐的分解反应浆液中分离出乙二醇和对苯二甲酸的固体盐的固液分离，溶解，杂质去除步骤溶解在水中，不溶性杂质为 删除 （3）中和，结晶步骤，其中所述对苯二甲酸盐的溶液用酸中和，使对苯二甲酸可以结晶; （4）固液分离，其中对苯二甲酸晶体的浆液进行固液分离以使得可以获得和洗涤对苯二甲酸晶体的洗涤停止; 和（5）干燥，粉碎步骤，其中将洗涤的对苯二甲酸晶体干燥并粉碎。

公开(公告)号：US06580005B1

公开(公告)日：2003-06-17

申请号：US09721057

申请日：2000-11-22

申请人： Jinichi Yazaki ,  Kozaburo Sakano ,  Nobuyuki Funakoshi ,  Kazuho Tanaka

发明人： Jinichi Yazaki ,  Kozaburo Sakano ,  Nobuyuki Funakoshi ,  Kazuho Tanaka

IPC分类号： C07C5109

CPC分类号： C07C51/43 ,  C07C51/09 ,  C07C51/412 ,  C07C51/47 ,  C08J11/24 ,  C08J2367/02 ,  Y02W30/706 ,  C07C63/28 ,  C07C63/26

摘要： This invention provides a process a process for recovering terephthalic acid from pulverized products of spent polyethylene terephthalate. This process comprises (1) a decomposition reaction step where the pulverized products of spent polyethylene terephthalate are continuously subjected to decomposition reaction in ethylene glycol in the presence of alkali, which is equimolar or excessmolar relative to the polyethylene terephthalate, so that salt of terephthalic acid and ethylene glycol can be continuously obtained; (2) a solid-liquid separation, dissolution, impurities-removing step where the ethylene glycol is separated from decomposition reaction slurry of salt of terephthalic acid and ethylene glycol, and the solid salt of terephthalic acid is dissolved into water, while insoluble impurities are removed; (3) a neutralization, crystallization step, where solution of said salt of terephthalic acid is neutralized with acid so that terephthalic acid can be crystallized; (4) a solid-liquid separation, washing step where slurry of terephthalic acid crystals is subjected to solid-liquid separation so that the terephthalic acid crystals can be obtained and washed; and (5) a drying, pulverization step where the washed terephthalic acid crystals are dried and pulverized.

摘要翻译： 本发明提供一种从废聚对苯二甲酸乙二醇酯的粉碎产物中回收对苯二甲酸的方法。 该方法包括：（1）分解反应步骤，其中废聚对苯二甲酸乙二醇酯的粉碎产物在相对于聚对苯二甲酸乙二醇酯等摩尔或过量的碱的存在下在乙二醇中连续进行分解反应，使得对苯二甲酸的盐 可连续获得乙二醇; （2）从对苯二甲酸和乙二醇盐的分解反应浆液中分离出乙二醇和对苯二甲酸的固体盐的固液分离，溶解，杂质去除步骤溶解在水中，不溶性杂质为 删除 （3）中和，结晶步骤，其中所述对苯二甲酸盐的溶液用酸中和，使对苯二甲酸可以结晶; （4）固液分离洗涤步骤，其中将对苯二甲酸晶体的浆液进行固液分离，以获得和洗涤对苯二甲酸晶体; 和（5）干燥，粉碎步骤，其中将洗涤的对苯二甲酸晶体干燥并粉碎。