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METHOD OF OBTAINING LEVULINIC ACID BY ACID-CATALYTIC SACCHAROSE CONVERSION
METHOD OF OBTAINING LEVULINIC ACID BY ACID-CATALYTIC SACCHAROSE CONVERSION
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机译:酸催化蔗糖转化法获得白果酸的方法
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摘要
FIELD: chemistry.;SUBSTANCE: target product is obtained by acid-catalytic conversion of saccharose in presence of hydrochloric acid (90-250 g/l) as catalyst with addition of potassium chloride (10-80 g/l) at normal pressure. Into obtained solution of levulinic acid potassium chloride is added to concentration 30-200 g/l and levulinic acid is isolated without preliminary neutralisation of catalyst by extraction at 30-80°C in form of butyllevulinate, after which content of potassium chloride in remaining water solution of catalyst is reduced to 10-80 g/l by precipitation at 0+10°C, obtained butyllevulinate is hydrolysed into levulinic acid by boiling with water till complete distillation of butanol. After extraction excess of potassium chloride is precipitated from catalyst solution by cooling to temperature 0+10°C.;EFFECT: reduction of catalyst consumption and number of steps of target product extraction and reduction of extragent amount.;1 tbl, 7 ex
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机译:领域:化学物质:目标产物是通过在常压下加入盐酸钾(10-80 g / l),在盐酸(90-250 g / l)作为催化剂的条件下,通过蔗糖的酸催化转化而获得的。向所获得的乙酰丙酸溶液中加入氯化钾至浓度为30-200 g / l,在不预先中和催化剂的情况下,通过在30-80℃下以乙酰丙酸丁酯的形式萃取来分离乙酰丙酸,此后剩余水中氯化钾的含量通过在0 + 1 0℃下沉淀将催化剂的溶液降低至10-80g / l,将得到的乙酰丙酸丁酯通过用水煮沸直至丁醇完全蒸馏而水解为乙酰丙酸。提取后,通过冷却至0 + 1 0℃的温度从催化剂溶液中沉淀出过量的氯化钾;效果:减少催化剂消耗和目标产物提取的步骤数并减少萃取剂的量。1tbl,7 ex
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