公开(公告)号：WO1991011429A1

公开(公告)日：1991-08-08

申请号：PCT/US1991000370

申请日：1991-01-22

Applicant: OLIN CORPORATION

Inventor： OLIN CORPORATION ,  MASON, Robert, W. ,  IMM, Peter, C. ,  CRANEY, Paul, J. ,  OFFILL, Thomas, W. ,  BROOKER, Robert, T.

IPC: C07C205/11

CPC classification number: C07C201/16 ,  C07C205/06

Abstract: The present invention relates to a process for purifying an aromatic nitration product mixture comprising a nitrated aromatic compound, water, and nitric or sulfuric acid which comprises without regard to sequence: (a) removing at least a portion of said water from said product mixture by contacting and reacting said water in said mixture with magnesium nitrate trihydrate to form magnesium nitrate pentahydrate or magnesium nitrate hexahydrate and removing said magnesium nitrate pentahydrate or magnesium nitrate hexahydrate from said nitrated aromatic compound in said product mixture, and (b) removing at least a portion of said acid from said product mixture by contacting and reacting said acid with an ionic or non-ionic absorbent to form a reacted absorbent and removing said reacted absorbent from said nitrated aromatic compound in said product mixture.

公开(公告)号：WO1990012781A1

公开(公告)日：1990-11-01

申请号：PCT/US1990000654

申请日：1990-02-09

Applicant: OLIN CORPORATION

Inventor： OLIN CORPORATION ,  MASON, Robert, W. ,  IMM, Peter, C. ,  BORDELON, Kent, J.

IPC: C07C201/00

CPC classification number: C07C201/16 ,  C07C201/08 ,  C07C205/06

Abstract: This invention relates to a process for nitrating toluene to dinitrotoluene and phase separation of the product using an inorganic salt as a phase separation agent. The process involves the steps of (a) reacting toluene with nitric acid having an acid concentration of between about 60 and about 75 percent to produce mononitrotoluene, (b) reacting the mononitrotoluene with concentrated nitric acid to produce a mixture of dinitrotoluene and unreacted nitric acid, and (c) incorporating an inorganic salt phase separation agent into the mixture to cause phase separation thereof.

公开(公告)号：WO1992006937A1

公开(公告)日：1992-04-30

申请号：PCT/US1991007032

申请日：1991-09-26

Applicant: OLIN CORPORATION

Inventor： OLIN CORPORATION ,  IMM, Peter, C. ,  QUAKENBUSH, Allen, B.

IPC: C07C07/06

CPC classification number: C07C201/08 ,  C07C205/06

Abstract: Described herein is a continuous process for the production of dinitrotoluene characterized by the following steps: (a) reacting toluene with dilute nitric acid to produce a product mixture containing mononitrotoluene, water and unreacted nitric acid; (b) then separating the mononitrotoluene from the mixture; (c) then reacting the mononitrotoluene recovered from step (b) with concentrated nitric acid to produce a product mixture containing dinitrotoluene, water and unreacted nitric acid; (d) then separating a portion of the nitric acid from the mixture for recycle to step (c); (e) then adding water to the mixture of water, unreacted nitric acid and dinitrotoluene; (f) then separating the dinitrotoluene from the mixture by crystallization; (g) then recycling the remaining dilute nitric acid from step (f) to step (a).

公开(公告)号：EP0468968A1

公开(公告)日：1992-02-05

申请号：EP90903685.0

申请日：1990-02-09

Applicant: OLIN CORPORATION

Inventor： MASON, Robert, W. ,  IMM, Peter, C. ,  BORDELON, Kent, J.

IPC: C07C201 ,  C07C205

CPC classification number: C07C201/16 ,  C07C201/08 ,  C07C205/06

Abstract: L'invention se rapporte à un procédé de nitratation de toluène pour produire du dinitrotoluène, ainsi qu'à la séparation de phase du produit au moyen d'un sel inorganique utilisé comme agent de séparation de phase. Le procédé consiste: (a) à faire réagir le toluène avec de l'acide nitrique présentant une concentration d'acide comprise entre environ 60 et environ 75 %, de façon à produire du mononitrotoluène; (b) à faire réagir le mononitrotoluène avec de l'acide nitrique concentré, afin de produire un mélange de dinitrotoluène et d'acide nitrique n'ayant pas réagi; et (c) à incorporer un agent de séparation de phase à base d'un sel inorganique dans le mélange, afin d'obtenir la séparation de phase du mélange.

公开(公告)号：EP0468968B1

公开(公告)日：1994-08-03

申请号：EP90903685.7

申请日：1990-02-09

Applicant: OLIN CORPORATION

Inventor： MASON, Robert, W. ,  IMM, Peter, C. ,  BORDELON, Kent, J.

IPC: C07C205/06 ,  C07C201/08 ,  C07C201/16

CPC classification number: C07C201/16 ,  C07C201/08 ,  C07C205/06

Abstract: This invention relates to a process for nitrating toluene to dinitrotoluene and phase separation of the product using an inorganic salt as a phase separation agent. The process involves the steps of (a) reacting toluene with nitric acid having an acid concentration of between about 60 and about 75 percent to produce mononitrotoluene, (b) reacting the mononitrotoluene with concentrated nitric acid to produce a mixture of dinitrotoluene and unreacted nitric acid, and (c) incorporating an inorganic salt phase separation agent into the mixture to cause phase separation thereof.