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    • 5. 发明申请
    • PROCESS FOR PREPARING EPICHLOROHYDRIN FROM GLYCEROL
    • 从甘油制备苯丙醇的方法
    • US20120035380A1
    • 2012-02-09
    • US13060838
    • 2009-08-24
    • Walter Kanzler
    • Walter Kanzler
    • C07D301/02
    • C07C29/62C07D301/26C07C31/36C07C31/42
    • A process for preparing epichlorohydrin includes chlorinating glycerol with gaseous hydrogen chloride in a bubble column, by supplying hydrogen chloride, glycerol and a mixture of monochloropropanediol and residues of glycerol recycled from the distillation units connected downstream of the bubble column, dichloropropanol and residues to the bottom of the bubble column, and, close to the top of the bubble column, drawing off the mixture of monochloropropanediol, dichloropropanol, water, residues of glycerol and residues formed there and feeding it to at least one distillation unit, after which the dichloropropanol and water distilled off there are hydrolyzed with sodium hydroxide solution. Unconverted hydrogen chloride drawn off from the top of the bubble column is absorbed with freshly supplied glycerol in a scrubber, and this hydrogen chloride-containing glycerol is supplied at the bottom of the bubble column. Preference is given to increasing the conversion rate by using oxalic acid as a catalyst.
    • 制备表氯醇的方法包括在气泡塔中用氯化氢将甘油与氯化氢氯化,通过从气泡塔下游的蒸馏单元,二氯丙醇和残留物向底部供应氯化氢,甘油和一氯丙二醇与再循环的甘油残留物的混合物 的泡罩塔,并且靠近气泡塔的顶部,除去单氯丙二醇,二氯丙醇,水,甘油残留物和在那里形成的残留物的混合物,并将其送入至少一个蒸馏单元,之后将二氯丙醇和水 蒸馏出去,用氢氧化钠溶液水解。 从气泡塔顶部排出的未转化的氯化氢在洗涤器中用新鲜供应的甘油吸收,并且该含氯化氢的甘油在泡罩塔的底部提供。 优选使用草酸作为催化剂来提高转化率。