公开(公告)号：WO2013153412A1

公开(公告)日：2013-10-17

申请号：PCT/IB2012/000731

申请日：2012-04-12

Applicant: BANDODKAR, Hemant, Ratanakar ,  SAWANT, Dilip, Chandrakant

Inventor： BANDODKAR, Hemant, Ratanakar ,  SAWANT, Dilip, Chandrakant

IPC: C07C315/00 ,  C07C17/361 ,  C07C317/14

CPC classification number: C07C17/361 ,  C07C315/00 ,  C07C317/14 ,  C07C25/06

Abstract: The invention relates to a process for the single step conversion of isomeric mixture of dichlorodipheriyi sulfones to chlorobenzene. The invention further relates a process of using dilute sulfuric acid and re-circulating the dilute sulfuric acid.

Abstract translation: 本发明涉及一步法将二氯二苯代砜的异构体混合物转化为氯苯的方法。 本发明还涉及使用稀硫酸并再循环稀硫酸的方法。

公开(公告)号：WO2011067649A3

公开(公告)日：2011-11-03

申请号：PCT/IB2010003057

申请日：2010-11-30

Applicant: BANDODKAR HEMANT RATANAKAR ,  SAWANT DILIP CHANDRAKANT

Inventor： BANDODKAR HEMANT RATANAKAR ,  SAWANT DILIP CHANDRAKANT

IPC: C07C315/00 ,  C07C317/06 ,  C07C317/14

CPC classification number: C07C315/00 ,  C07C317/06 ,  C07C317/14

Abstract: The present invention provides a method for the preparation of polymer grade 4,4'-dichlorodiphenyl sulfone in steps comprising reacting dimethyl sulfate and sulfur trioxide optionally containing a catalyst; reacting the formed dimethyl pyrosulfate with the unreacted sulfur trioxide optionally in the presence of a catalyst; reacting the reaction mixture with monochlorobenzene optionally containing a catalyst; optionally removing unreacted dimethyl sulfate; isolating crude 4,4'-dichlorodiphenyl sulfone using an organic solvent / organic solvent - water mixture; recovering the solvent from mother liquor; optionally recovering the isomeric mixture of dichlorodiphenyl sulfones from mother liquor; optionally, conversion of residual isomeric mixture of dichlorodiphenyl sulfones to a product selected from diphenyl sulfone, 2-aminodiphenyl sulfone; 2,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxydiphenyl sulfone; optionally recovering monochlorobenzene sulfonic acid and/or monochlorobenzene from the mother liquor; optionally recovering sulfuric acid from the residual liquor; optionally recycling the solvent; and purifying 4,4'-dichlorodiphenyl sulfone from crude followed by crystallization. Further the present invention discloses a process in which isomeric mixture of 4,4'-, 3,4'-, and 2,4'-dichlorodiphenyl sulfone produced during the preparation of 4,4'-dichlorodiphenyl sulfone is converted to value added products such as diphenyl sulfone, 2,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxydiphenyl sulfone and 2-aminodiphenyl sulfone.

Abstract translation: 本发明提供了一种制备聚合物级4,4'-二氯二苯砜的方法，包括使任选含有催化剂的硫酸二甲酯和三氧化硫反应; 任选地在催化剂存在下使形成的焦硫酸二甲酯与未反应的三氧化硫反应; 将反应混合物与任选含有催化剂的单氯苯反应; 任选地除去未反应的硫酸二甲酯; 使用有机溶剂/有机溶剂 - 水混合物分离粗制4,4'-二氯二苯砜; 从母液中回收溶剂; 任选地从母液中回收二氯二苯砜的异构体混合物; 任选地，将二氯二苯基砜的残余异构体混合物转化成选自二苯基砜，2-氨基二苯基砜的产物; 2,4'-二羟基二苯砜，4,4'-二羟基二苯砜; 任选地从母液中回收一氯苯磺酸和/或一氯苯; 任选地从残余液中回收硫酸; 任选地再循环溶剂; 并从粗品中纯化4,4'-二氯二苯基砜，然后结晶。 此外，本发明公开了一种方法，其中在制备4,4'-二氯二苯砜期间产生的4,4'-，3,4'-和2,4'-二氯二苯砜的异构体混合物转化为增值产物 如二苯基砜，2,4'-二羟基二苯基砜，4,4'-二羟基二苯基砜和2-氨基二苯基砜。

公开(公告)号：WO2011067649A2

公开(公告)日：2011-06-09

申请号：PCT/IB2010/003057

申请日：2010-11-30

Applicant: BANDODKAR, Hemant, Ratanakar ,  SAWANT, Dilip, Chandrakant

Inventor： BANDODKAR, Hemant, Ratanakar ,  SAWANT, Dilip, Chandrakant

IPC: C07C315/00

CPC classification number: C07C315/00 ,  C07C317/06 ,  C07C317/14

Abstract: The present invention provides an economic and environmentally friendly method for the preparation of polymer grade 4,4'-dichlorodiphenyl sulfone which is substantially free of 2,4' and 3,4'-isomers of dichlorodiphenyl sulfone with yield of over 90%, with substantially reduced reaction times without the use of impregnated catalysts. Further no toxic byproducts such as dimethyl pyrosulfate are formed thereby reducing the load on effluent treatment with the added advantage of substantially recycling the reactants and byproducts. Further the present invention discloses a process is disclosed in which isomeric mixture of 4,4'-, 3,4'-, and 2,4'-dichlorodiphenyl sulfone produced during the preparation of 4,4'-dichlorodiphenyl sulfone is converted to value added products such as diphenyl sulfone, 2,4'- dihydroxydiphenyl sulfone, 4,4'-dihydroxydiphenyl sulfone and 2-aminodiphenyl sulfone.

Abstract translation: 本发明提供了一种用于制备聚合物级4,4'-二氯二苯砜的经济和环保方法，其基本上不含二氯二苯砜的2,4'和3,4'-异构体，产率超过90％，其中 在不使用浸渍催化剂的情况下大大减少了反应时间。 此外，没有形成毒性副产物，例如焦磷酸二甲酯，从而减少了对流出物处理的负担，还具有基本上回收反应物和副产物的附加优点。 此外，本发明公开了一种方法，其中在制备4,4'-二氯二苯砜期间产生的4,4'-，3,4'-和2,4'-二氯二苯基砜的异构体混合物转化为值 加成产物如二苯砜，2,4'-二羟基二苯基砜，4,4'-二羟基二苯基砜和2-氨基二苯基砜。