公开(公告)号：NO144208C

公开(公告)日：1981-08-05

申请号：NO744213

申请日：1974-11-22

Applicant: BASF AG

Inventor： DIEM HANS ,  LIBOWITZKY HERBERT ,  MATTHIAS GUENTHER ,  DUDECK CHRISTIAN ,  LEHMANN GUNTER

IPC: C07C45/00 ,  C07C45/86 ,  C07C47/058 ,  C07C67/00

Abstract: 1480921 Stabilizing aqueous formaldehyde BASF AG 25 Nov 1974 [26 Nov 1973] 50896/74 Heading C2C Aqueous formaldehyde solutions are stabilized by means of a bis-guanamine of formula wherein the two substituent on the phenylene ring are in m or p-position to each other. 0À001 to 0À5% by weight of stabilizer may be used and the formaldehyde solution may contain 28-65% by weight of formaldehyde. The stabilizer may be added as a stock solution in a formaldehyde solution of higher strength than that to be stabilized and having a pH of 2À5 to 5À8 and the latter is preferably kept at 40-80‹ C. for 10-30 hours before adding the stock solution.

公开(公告)号：NO144208B

公开(公告)日：1981-04-06

申请号：NO744213

申请日：1974-11-22

Applicant: BASF AG

Inventor： DIEM HANS ,  LIBOWITZKY HERBERT ,  MATTHIAS GUENTHER ,  DUDECK CHRISTIAN ,  LEHMANN GUNTER

IPC: C07C45/00 ,  C07C45/86 ,  C07C47/058 ,  C07C67/00

Abstract: 1480921 Stabilizing aqueous formaldehyde BASF AG 25 Nov 1974 [26 Nov 1973] 50896/74 Heading C2C Aqueous formaldehyde solutions are stabilized by means of a bis-guanamine of formula wherein the two substituent on the phenylene ring are in m or p-position to each other. 0À001 to 0À5% by weight of stabilizer may be used and the formaldehyde solution may contain 28-65% by weight of formaldehyde. The stabilizer may be added as a stock solution in a formaldehyde solution of higher strength than that to be stabilized and having a pH of 2À5 to 5À8 and the latter is preferably kept at 40-80‹ C. for 10-30 hours before adding the stock solution.