Title: New process for preparation of vitamin C from special vitamin C sodium
Application Number: 94103195 Application Date: 1994.03.24
Publication Number: 1098412 Publication Date: 1995.02.08
Approval Pub. Date: Granted Pub. Date: 1999.09.01
International Classifi-cation: C07D307/62
Applicant(s) Name: Xian Pharmaceutical Factory, Shaanxi Prov. Address: 710077
Inventor(s) Name: Wang Fenghuai, Feng Lianrong
Attorney & Agent: PENG DONGYING
Abstract:
     The present invention relates to a process for preparing iso-Vc by using iso-VcNa passing through cation exchange resin. Its iso-VcNa raw material adopted by said invention is one of four quality-different raw materials, such as crude wet iso-VcNa, crude dry iso-VcNa, iso-VcNa decolored press filtrate and fine VcNa which are intermediates for preparing iso-VcNa, and the above-mentioned raw material is passed through such processes of cation exchange resin exchanging, concentrating, crystallizing, filtering, washing and oven-drying, so that the iso-VcNa finished product can be made up. Said invention raises the iso-VcNa exchange concentration and iso-Vc concentration temp., and adopts the main technological conditions of indiscriminate application of mother washing liquid etc. so that the iso-Vc yield and quality can be raised.
Time: 6
<- Previous Patent:Cephalosporin derivative   |  Next Patent:Photochromic naphthopyran compoun... ->