公开(公告)号：US3573173A

公开(公告)日：1971-03-30

申请号：US3573173D

申请日：1968-07-24

Applicant: MITSUI TOATSU CHEMICALS

Inventor： OTSUKA EIJI ,  KANAI KAZUMICHI ,  SAKAI TADAO ,  INOUE SHIGERU ,  HASHIMOTO NOBUYOSHI ,  YAKABE MASATOSHI ,  KIMURA TETSUO

IPC: C07C273/04 ,  C07C127/10

CPC classification number: C07C273/04

Abstract: A PROCESS FOR REMOVING EXCESS AMMONIA IN UREA SYNTHESIS WHICH COMPRISES SEPARATING EXCESS AMMONIA FROM A UREA SYNTHESIS EFFLUENT IN THE FORM OF AN AMMONIA GAS, MAKING THE AMMONIA GAS FREE OF CARBON DIOXIDE IF NECESSARY AND BRINGING THE AMMONIA GAS FREE OF CARBON DIOXIDE WITH RAW MATERIAL LIQUID AMMONIA THEREBY THE AMMONIA GAS IS CONDENSED TO FORM LIQUID AMMONIA AT HIGH TEMPERATURE.

公开(公告)号：CA985300A

公开(公告)日：1976-03-09

申请号：CA149198

申请日：1972-08-11

Applicant: MITSUI TOATSU CHEMICALS

Inventor： HASHIMOTO NOBUYOSHI ,  ASANO SHIRO ,  HONDA TADATOSHI ,  YOSHIMURA KIYOTAKA ,  TSUCHIYA RYOZI

IPC: C07B61/00 ,  B01J21/00 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C233/09

公开(公告)号：AU4564872A

公开(公告)日：1974-02-21

申请号：AU4564872

申请日：1972-08-16

Applicant: MITSUI TOATSU CHEMICALS

Inventor： HASHIMOTO NOBUYOSHI ,  YOSHIMURA KIYOTAKA ,  ASANO SHIRO ,  HONDA TADATOSHI ,  TSUCHIYA RYOZI

IPC: B01J8/20 ,  B01J8/22 ,  C07C20060101 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C233/09 ,  C07C103/08 ,  C07C103/12

公开(公告)号：CA939293A

公开(公告)日：1974-01-01

申请号：CA91858

申请日：1970-08-28

Applicant: MITSUI TOATSU CHEMICALS

Inventor： OTSUKA EIJI ,  KANAI KAZUMICHI ,  INOUE SHIGERU ,  HASHIMOTO NOBUYOSHI

IPC: C07C67/00 ,  C07C239/00 ,  C07C273/16

Abstract: 1295742 Treatment of urea-synthesis effluent MITSUI TOATSU CHEMICALS Inc 19 Aug 1970 [30 Aug 1969] 39911/70 Heading C2C Unreacted materials are separated from a urea-synthesis process obtained by reacting ammonia and carbon dioxide and containing urea, water, ammonia and carbon dioxide, by a high pressure distillation at 10-100 kg./cm. 2 gauge to remove the greater part of the unreacted ammonia and carbon dioxide as a gaseous mixture and separating the remaining unreacted materials at a low pressure by introducing the depleted urea-synthesis effluent into a low pressure rectification zone maintained at a pressure up to 5 kg./cm. 2 gauge and a head temperature of 60-120‹ C., heating the urea solution from the rectification zone in a heating zone maintained at 100-140‹ C. to drive out the remaining unreacted materials as a gaseous mixture of carbon dioxide and ammonia, and stripping urea solution from the heating zone in a stripping zone by contact with 0À01 to 0À2 mol. of carbon dioxide per mol. of urea.

公开(公告)号：CA879729A

公开(公告)日：1971-08-31

申请号：CA879729D

Applicant: MITSUI TOATSU CHEMICALS

Inventor： OTSUKA EIJI ,  INOUE SHIGERU ,  SAKAI TADAO ,  KANAI KAZUMICHI ,  HASHIMOTO NOBUYOSHI ,  YAKABE MASATOSHI ,  KIMURA TETSUO

公开(公告)号：CA984853A

公开(公告)日：1976-03-02

申请号：CA149199

申请日：1972-08-11

Applicant: MITSUI TOATSU CHEMICALS

Inventor： HASHIMOTO NOBUYOSHI ,  ASANO SHIRO ,  HONDA TADATOSHI ,  YOSHIMURA KIYOTAKA ,  TSUCHIYA RYOZI

IPC: B01J8/20 ,  B01J8/22 ,  C07C20060101 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C233/09

公开(公告)号：AU4564972A

公开(公告)日：1974-02-21

申请号：AU4564972

申请日：1972-08-16

Applicant: MITSUI TOATSU CHEMICALS

Inventor： HASHIMOTO NOBUYOSHI ,  YOSHIMURA KIYOTAKA ,  ASANO SHIRO ,  HONDA TADATOSHI ,  TSUCHIYA RYOZI

IPC: C07B61/00 ,  B01J21/00 ,  C07C67/00 ,  C07C231/00 ,  C07C231/06 ,  C07C233/09 ,  C07C103/08 ,  C07C103/12