公开(公告)号：JPS62298540A

公开(公告)日：1987-12-25

申请号：JP14542287

申请日：1987-06-12

Applicant: HOECHST AG

Inventor： POST HENDRIK W ,  VON PLESSEN HELMOLD ,  LENDLE WILHELM

IPC: C07B61/00 ,  B01J21/04 ,  C07C17/00 ,  C07C17/16 ,  C07C17/38 ,  C07C17/395 ,  C07C19/03 ,  C07C67/00

公开(公告)号：DE3768561D1

公开(公告)日：1991-04-18

申请号：DE3768561

申请日：1987-06-10

Applicant: HOECHST AG

Inventor： POST HENDRIK W ,  VON PLESSEN HELMOLD ,  LENDLE WILHELM

IPC: C07B61/00 ,  B01J21/04 ,  C07C17/00 ,  C07C17/16 ,  C07C17/38 ,  C07C17/395 ,  C07C19/03 ,  C07C67/00 ,  C07C19/02

Abstract: A process is described for the removal of dimethyl ether in methyl chloride by catalytic cleavage by means of hydrogen chloride. Dimethyl ether is present as an impurity in crude methyl chloride produced by the catalytic esterification of methanol. The crude methyl chloride is cooled so that water and hydrogen chloride separate out. Gaseous hydrogen chloride is then added to the methyl chloride in an amount corresponding to at least twice the molar amount of dimethyl ether, and the gaseous mixture is passed over a methanol esterification contact catalyst at an elevated temperature.

公开(公告)号：DE59102190D1

公开(公告)日：1994-08-18

申请号：DE59102190

申请日：1991-02-22

Applicant: HOECHST AG

Inventor： VON PLESSEN HELMOLD ,  FRITSCHE-LANG WOLFRAM ,  LORKE HORST

IPC: C01B17/90 ,  C01B17/94 ,  C07C201/08

Abstract: PCT No. PCT/EP91/00329 Sec. 371 Date Oct. 23, 1992 Sec. 102(e) Date Oct. 23, 1992 PCT Filed Feb. 22, 1991 PCT Pub. No. WO91/13828 PCT Pub. Date Sep. 19, 1991.Process for conditioning waste sulfuric acid which is prone to precipitation of tars or resins, which comprises adding emulsifiers, preferably long-chain polyethers, to the waste sulfuric acid.

公开(公告)号：CA1332840C

公开(公告)日：1994-11-01

申请号：CA599060

申请日：1989-05-09

Applicant: HOECHST AG

Inventor： VON PLESSEN HELMOLD ,  RITTNER SIEGBERT

IPC: C07C51/00 ,  C07C65/11 ,  C07C65/24 ,  C07D319/12 ,  C08G63/06

Abstract: The invention relates to the dioxane adduct of 2hyroxynaphthalene-6-carboxylic acid which adduct comprises 1 mol of 1,4-dioxane and about 2 mol of 2-hydroxynaphthalene-6-carboxylic acid per mol. The invention further relates to a process for the preparation of this adduct, wherein the 2hydroxynaphthalene-6-carboxylic acid is dissolved in dioxane or a mixture thereof with water or with an organic solvent and then allowed to crystallize. The adduct is useful for an easy isolation and purification of 2-hydroxynaphthalene-6-carboxylic acid from the reaction products of the Kolbe-Schmitt reaction. The adduct is of special significance for the production of very pure 2-hydroxynaphthalene-6-carboxylic acid required in manufacturing of polyesters.

公开(公告)号：DE3620069A1

公开(公告)日：1988-01-21

申请号：DE3620069

申请日：1986-06-14

Applicant: HOECHST AG

Inventor： POST HENDRIK W ,  VON PLESSEN HELMOLD ,  LENDLE WILHELM

IPC: C07B61/00 ,  B01J21/04 ,  C07C17/00 ,  C07C17/16 ,  C07C17/38 ,  C07C17/395 ,  C07C19/03 ,  C07C67/00 ,  C07C19/02

Abstract: A process is described for the removal of dimethyl ether in methyl chloride by catalytic cleavage by means of hydrogen chloride. Dimethyl ether is present as an impurity in crude methyl chloride produced by the catalytic esterification of methanol. The crude methyl chloride is cooled so that water and hydrogen chloride separate out. Gaseous hydrogen chloride is then added to the methyl chloride in an amount corresponding to at least twice the molar amount of dimethyl ether, and the gaseous mixture is passed over a methanol esterification contact catalyst at an elevated temperature.

公开(公告)号：FI944654A0

公开(公告)日：1994-10-05

申请号：FI944654

申请日：1994-10-05

Applicant: HOECHST AG

Inventor： LYDING GUENTHER ,  PILLE MARIA ,  VON PLESSEN HELMOLD ,  SEMEL JOACHIM

IPC: B09B3/00 ,  B01D3/14 ,  C08J11/06 ,  C10B53/00 ,  C10B53/07 ,  C10G5/00 ,  C08J

Abstract: Heating of polyvinyl chloride, in particular plasticised polyvinyl chloride, to a temperature of from 250 to 500 DEG C in the absence of oxygen gives a low-chlorine, carbon-containing residue, plasticiser and hydrogen chloride.

公开(公告)号：AT108420T

公开(公告)日：1994-07-15

申请号：AT91904376

申请日：1991-02-22

Applicant: HOECHST AG

Inventor： VON PLESSEN HELMOLD ,  FRITSCHE-LANG WOLFRAM ,  LORKE HORST

IPC: C01B17/90 ,  C01B17/94 ,  C07C201/08

Abstract: PCT No. PCT/EP91/00329 Sec. 371 Date Oct. 23, 1992 Sec. 102(e) Date Oct. 23, 1992 PCT Filed Feb. 22, 1991 PCT Pub. No. WO91/13828 PCT Pub. Date Sep. 19, 1991.Process for conditioning waste sulfuric acid which is prone to precipitation of tars or resins, which comprises adding emulsifiers, preferably long-chain polyethers, to the waste sulfuric acid.

公开(公告)号：CA1304402C

公开(公告)日：1992-06-30

申请号：CA588138

申请日：1989-01-13

Applicant: HOECHST AG

Inventor： VON PLESSEN HELMOLD ,  RITTNER SIEGBERT ,  VOLK HEINRICH ,  WYKYPIEL WERNER ,  NEEB RUDOLF

IPC: C07C51/00 ,  C07C51/43 ,  C07C65/11 ,  C07C67/00

Abstract: HOE 88/F 006 of the disclosure: Process for the purification of 2-hydroxynaphthalene-6-carboxylic acid The invention relates to a process for the purification of Z-hydroxynaphthalene-6-carboxylic acid by recrystallization. In this process, the crude acid is recrystallized from water-miscible linear or cyclic aliphatic ethers, aliphatic polyethers or aliphatic hydroxy ethers or from at least 10 % strength by weight aqueous solutions of these ethers. Recrystallization from a 35 - 90 % strength by weight aqueous solution of 1,4-dioxane is particularly preferred.

公开(公告)号：FI944654A

公开(公告)日：1995-04-08

申请号：FI944654

申请日：1994-10-05

Applicant: HOECHST AG

Inventor： LYDING GUENTHER ,  PILLE MARIA ,  VON PLESSEN HELMOLD ,  SEMEL JOACHIM

IPC: B09B3/00 ,  B01D3/14 ,  C08J11/06 ,  C10B53/00 ,  C10B53/07 ,  C10G5/00 ,  C08J11/02

Abstract: Heating of polyvinyl chloride, in particular plasticised polyvinyl chloride, to a temperature of from 250 to 500 DEG C in the absence of oxygen gives a low-chlorine, carbon-containing residue, plasticiser and hydrogen chloride.

公开(公告)号：ES2057870T3

公开(公告)日：1994-10-16

申请号：ES91904376

申请日：1991-02-22

Applicant: HOECHST AG

Inventor： VON PLESSEN HELMOLD ,  FRITSCHE-LANG WOLFRAM ,  LORKE HORST

IPC: C01B17/90 ,  C01B17/94 ,  C07C201/08

Abstract: PCT No. PCT/EP91/00329 Sec. 371 Date Oct. 23, 1992 Sec. 102(e) Date Oct. 23, 1992 PCT Filed Feb. 22, 1991 PCT Pub. No. WO91/13828 PCT Pub. Date Sep. 19, 1991.Process for conditioning waste sulfuric acid which is prone to precipitation of tars or resins, which comprises adding emulsifiers, preferably long-chain polyethers, to the waste sulfuric acid.