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PROCESS AND PLANT FOR THE PRODUCTION OF UREA WITH HIGH CONVERSION YIELD AND LOW ENERGY CONSUMPTION

机译:高转化率低能耗尿素生产工艺及装置

摘要

The present invention relates to a process for the preparation of urea by reacting ammonia with carbon dioxide in a reaction space to obtain a reaction mixture comprising urea, urea and free ammonia in aqueous solution, treating the mixture to partially decompose the aqueous urea and partially separating the free ammonia. receiving a first stream containing carbon dioxide in a vapor phase, a stream containing urea and a carbamate residue in aqueous solution, subjecting the first stream containing ammonia and carbon dioxide in a vapor phase to at least partial condensation to a solution of urea in an aqueous solution, a stream of material is fed to a urea recovery section where the carbamate residue is separated from the urea so that an aqueous solution a second carbamate moiety, the process further comprising: subjecting at least a portion of the second aqueous carbamate moiety obtained in the recovery phase to a partial decomposition of a second vapor phase containing a second stream of ammonia and carbonate and an a second stream of ammonia and carbon dioxide in vapor phase is subjected to at least partial condensation to obtain a third portion of the carbamate in aqueous solution, the third portion of the carbamate being recycled to the reaction space. The present invention also relates to a urea production plant comprising a single urea synthesis reactor (1), a first stripping unit (2), said process for the partial decomposition of the reaction mixture leaving the said reactor (1) and partially separating the free ammonia present in said aqueous solution. means (6) for partially condensing the vapor leaving the first stripping unit (2) and returning the carbamate top portion of the aqueous solution to said reactor (6), a residual carbamate containing urea containing material leaving said first stripping unit (2) and (3, 4, 7, 8) for separating the urea produced in the reactor (1) from a second fraction of carbamate in aqueous solution, characterized in that a second stripping unit (9) is provided in the aqueous solution. at least a portion of the vapors leaving said second stripping unit (9)
机译:本发明涉及一种尿素的制备方法,该方法是通过使氨与二氧化碳在反应空间中反应,从而获得包含尿素,尿素和游离氨的水溶液的反应混合物,处理该混合物以使尿素水溶液部分分解并部分分离。游离氨。接收在气相中包含二氧化碳的第一物流,在水溶液中包含尿素和氨基甲酸酯残留物的物流,使在气相中包含氨和二氧化碳的第一物流至少部分缩合为尿素在水溶液中的溶液在溶液中,将物料流送入尿素回收区,在尿素回收区将氨基甲酸酯残留物与尿素分离,从而使水溶液中形成第二氨基甲酸酯部分,该方法还包括:使至少一部分第二氨基甲酸酯水溶液获得。使包含第二部分氨和碳酸盐物流以及第二部分氨和二氧化碳物流的第二气相的回收阶段进行部分分解,以使其至少部分冷凝,从而获得第三部分的氨基甲酸酯水溶液。溶液中,将氨基甲酸酯的第三部分再循环至反应空间。本发明还涉及尿素生产设备,其包括单个尿素合成反应器(1),第一汽提单元(2),所述用于部分分解反应混合物的方法离开所述反应器(1)并部分分离游离所述水溶液中存在氨。装置(6),用于部分冷凝离开第一汽提单元(2)的蒸汽,并将水溶液的氨基甲酸酯顶部返回所述反应器(6),含有氨基甲酸酯的残留氨基甲酸酯离开所述第一汽提单元(2),以及(3、4、7、8)用于将反应器(1)中产生的尿素与水溶液中氨基甲酸酯的第二部分分离的特征在于,在水溶液中提供第二汽提单元(9)。至少一部分蒸气离开所述第二汽提单元(9)

著录项

  • 公开/公告号HU224478B1

    专利类型

  • 公开/公告日2005-09-28

    原文格式PDF

  • 申请/专利权人 UREA CASALE S.A.;

    申请/专利号HU19980000232

  • 发明设计人 PAGANI GIORGIO;ZARDI UMBERTO;

    申请日1996-01-31

  • 分类号C07C273/04;

  • 国家 HU

  • 入库时间 2022-08-21 22:17:49

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