公开(公告)号：US3651135A

公开(公告)日：1972-03-21

申请号：US3651135D

申请日：1969-12-01

Applicant: RHONE POULENC SA

Inventor： BOICHARD JACQUES ,  BROSSAR BERNARD PIERRE ,  DUROUX JACQUES MARIUS ,  JANIN RAYMOND MARC CLEMENT

IPC: C07C51/275 ,  C07C55/06

CPC classification number: C07C51/275 ,  C07C55/06

Abstract: OXALIC ACID IS MADE BY OXIDIZING PROPYLENE WITH AT LEAST 50% NITRIC ACID AT 40 TO 80*C.

公开(公告)号：US3549696A

公开(公告)日：1970-12-22

申请号：US3549696D

申请日：1967-05-23

Applicant: RHONE POULENC SA

Inventor： DUROUX JACQUES MARIUS ,  ELIE LOUIS MARIUS

IPC: C07C51/27 ,  C07C67/39 ,  C07C203/04 ,  C07C51/32

CPC classification number: C07C51/27 ,  C07C67/39 ,  C07C201/02 ,  C07C55/06 ,  C07C59/08 ,  C07C69/36 ,  C07C203/04

Abstract: 1,159,066. Oxalic acid. RHONE-POULENC S.A. 25 May, 1967 [25 May, 1966], No. 24443/67. Heading C2C. Oxalic acid is prepared by oxidizing propylene, or an intermediate product (for example lactic acid or α-nitratolactic acid) containing two or three carbon atoms which can be formed by nitric acid and/or nitrogen peroxide oxidation of propylene, with nitric acid in the presence of, as catalyst, a compound of iron, aluminium, chromium, tin, bismuth, iodine, which is soluble in the reaction medium. The catalyst, which may be present in an amount from 0À01 to 10% and preferably from 0À1 to 2% by weight (expressed as metal or as iodine) based on the weight of the reaction mixture, is preferably a sulphate, nitrate, chloride or phosphate of iron, aluminium, chromium, tin or bismuth; ferrous oxide, ferric oxide, or chromium trioxide; an iodate; a chromate; or chromic acid. The catalysts may be used in processes wherein gaseous propylene is passed into an aqueous medium containing at least 50% by weight of nitric acid at 40-80‹ C. or by introducing the propylene into nitric acid and then heating the solution obtained and wherein the catalyst may be introduced at the beginning of the reaction or at the beginning of the conversion of the oxidation products, for example lactic acid or α-nitratolactic acid, preferably by dissolving the catalyst in the oxidizing agent. Oxalic acid is prepared by treating propylene with nitric acid containing chromium nitrate and subsequently passing oxygen through the reaction mixture and heating; by treating propylene with aqueous nitric acid containing nitrogen peroxide and subsequently heating with chromium nitrate, ferric nitrate, stannous chloride, aluminium nitrate, bismuth nitrate or potassium iodate; by treating α-nitratolactic acid with nitric acid containing chromic acid; and by reacting lactic acid with nitric acid containing chromic acid. Suitable apparatus for the reaction is described by reference to drawings (not shown). α-Nitrato-lactic acid is obtained by treating a mixture of oxygen and propylene with nitrogen peroxide at 0‹ C.

公开(公告)号：US3692830A

公开(公告)日：1972-09-19

申请号：US3692830D

申请日：1970-12-09

Applicant: DANIEL GRAS ,  RHONE POULENC SA

Inventor： CHARAMEL ANDRE ,  DUROUX JACQUES MARIUS ,  SIQUET SERGE ,  DESCROIX JAQUES

IPC: C07C51/275 ,  C07C51/32

CPC classification number: C07C51/275 ,  C07C55/06

Abstract: Oxalic acid is produced by absorbing propylene in strong nitric acid and then heating the solution while removing the oxides of nitrogen formed, preferably after introducing oxygen into the solution.

Abstract translation: 通过在强硝酸中吸收丙烯，然后加热溶液同时除去形成的氮氧化物，优选在将氧气引入溶液中之后，生产草酸。

公开(公告)号：US3519676A

公开(公告)日：1970-07-07

申请号：US3519676D

申请日：1966-12-21

Applicant: RHONE POULENC SA

Inventor： DUROUX JACQUES MARIUS ,  FAYE PIERRE LOUIS

IPC: C07C67/08 ,  C07C69/34 ,  C07C69/76 ,  C07C69/80 ,  C07C69/82

CPC classification number: C07C69/82 ,  C07C67/08 ,  C07C69/34 ,  C07C69/76 ,  C07C69/80