公开(公告)号：DE4020855A1

公开(公告)日：1992-01-02

申请号：DE4020855

申请日：1990-06-29

Applicant: HOECHST AG

Inventor： RITTNER SIEGBERT DR ,  RIEDEL ALFRED DR ,  HAUTZEL VOLKER DR ,  GSCHEIDMEIER MANFRED DR ,  MAGINOT JOACHIM DIPL ING ,  TETZLAFF HERIBERT DR

IPC: C07C45/81

Abstract: Impurities are sepd. from technical grade (at least 50%) camphor (I) by melting the (I), and then cooling to allow pure (I) to crystallise out. The crystallisation process which initially sets in and continues practically to a standstill, is set in motion against at least once by a heating step. Pref., 1-4 heating steps are employed. USE/ADVANTAGE - This method gives pure (I) without the need for solvent recrystallisation (and consequently drying), so avoids loss of both product and solvent. Pure (I) is used as a plasticiser for cellulose nitrate (in prepn. of celluloid and nitrocellulose lacquer) or cellulose propionate. It is also useful as a pharmaceutical (antiseptic or cardiac stimulant);perfume component; clothes moth repellent; in smokeless gunpowder or primers, and as fumigant. (4pp Dwg.No.0/0)

公开(公告)号：DE4003043A1

公开(公告)日：1991-08-08

申请号：DE4003043

申请日：1990-02-02

Applicant: HOECHST AG

Inventor： HAUTZEL VOLKER DR ,  RITTNER SIEGBERT DR

IPC: C07C51/12 ,  C07C51/10 ,  C07C65/11

Abstract: 2-Hydroxy-naphthalene-6-carboxylic acid or its dipotassium salt can be obtained with high yield and high purity and without appreciable formation of the isomeric compound 2-naphthol-3-carboxylic acid by reacting potassium- beta -naphtholate with potassium carbonate in the presence of carbon monoxide at a temperature above 260 DEG C in potassium formate as the solvent.