近期纯碱生产的发展与一种同时生产氯乙烯和纯碱的非电解过程

Recent Developments of Soda ash Production and an Nonelectrolytic Process to Produce VCM and Soda ash

荷兰阿克苏化学公司采用一种非电解的同时生产纯碱和氯乙烯的ＡＺＣ过程，希望降低能耗费用的二分之一。过程采取多循环系统的技术形式。实质是一个催化有机循环。循环流体组成为约３５％的己二腈，其余为Ｉ２Ｃｌ－等复合离子。流体在压力下吸收乙烯，乙烯与Ｉ２Ｃｌ－反应生成碘氯乙烷和Ｉ－。碘氯乙烷转化为二氯乙烷。二氯乙烷被转化为氯乙烯。下一步骤是此流体在加入纯固体食盐而析出ＮａＨＣＯ３，ＮａＨＣＯ３被煅烧成纯碱。

Akzo Zout Chemie B.V.hopes to cut its energy bills in half with a new nonelectrolytic process that produces both VCM and soda.The process takes the technical form of a multicycle system.The essential new aspect is the catalyst oil loop,in which a fluid circulates,which consists of about 35 percent adiponitrile,and for the rest complex ions of I 2Cl - etc. This fluid absorbs ethylene under pressure.By the reaction of ethylene and I 2Cl -,iodochloroethane and I 2 are formed.Iodochloroethane converts to dichloroethane.Dichloroethane can be converted to VCM. In the next steps,this is fed to a NaHCO 3 crystalliser together with pure salt in solid form.The NaHCO 3 can be calcined to soda sah.