化工学报
化工學報
화공학보
JOURNAL OF CHEMICAL INDUSY AND ENGINEERING (CHINA)
2010年
3期
699-703
,共5页
马淳安%徐颖华%褚有群%毛信表%赵峰鸣%朱英红
馬淳安%徐穎華%褚有群%毛信錶%趙峰鳴%硃英紅
마순안%서영화%저유군%모신표%조봉명%주영홍
3,6-二氯吡啶甲酸%3,4,5,6-四氯吡啶甲酸%电化学合成%工业化
3,6-二氯吡啶甲痠%3,4,5,6-四氯吡啶甲痠%電化學閤成%工業化
3,6-이록필정갑산%3,4,5,6-사록필정갑산%전화학합성%공업화
3,6-dichloropicolinic acid%3,4,5,6-tetrachloropicolinic acid%electrochemical synthesis%industrialization
The industrialization of electrochemical synthesis of 3,6-dichloropicolinic acid(3,6-DCP) from 3,4,5,6-tetrachloropicolinic acid(3,4,5,6-TCP) in a tank-type undivided electrolytic cell with silver cathode was investigated.The experimental results showed that the electrolytic performance greatly depended on the operation parameters, such as flow rate of electrolyte, temperature, and concentration of NaOH.The reduction of 3,4,5,6-TCP to 3,6-DCP was favored by increasing temperature and flow rate of electrolyte.Industrialization tests of electrochemical synthesis of 3,6-DCP were conducted under the following conditions: silver cathode, temperature 313 K, flow rate 6 cm·s~(-1), concentration of NaOH 8%(mass), concentration of 3,4,5,6-TCP 5%(mass), cathode current density 600 A·m~(-2).The current efficiency and conversion ratio of 3,4,5,6-TCP were more than 76% and 99%, respectively.The yield of 3,6-DCP was up to 90% and DC power consumption was 2.939 kW·h·(kg 3,6-DCP)~(-1).The purity of the product was higher than 95%, and its melting point was 151-153℃.
