共查询到19条相似文献,搜索用时 125 毫秒
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选用新型填料塔,对联醇生产中排放残液采用汽提法进行处理,不仅可以回收甲醇,而且减少了残液排放造成的环境污染。该工艺简单,投资少,见效快。 相似文献
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青海桂鲁化工有限公司80万吨/年甲醇精馏装置精馏装置由于原始设计采用双塔精馏工艺,精馏残液排放指标远远不能满足后工段生产需要,造成使用该残液工段的设备堵塞,严重影响装置的长周期运行,宁波中科远东催化工程技术有限公司对装置进行技术改造,增设甲醇精馏残液回收工艺系统流程,其中回收塔和再沸器2台为新设备、其余设备采用废旧设备改造而成。一年后装置改造竣工运行,塔顶产出合格甲醇,塔底废液也达到设计指标。甲醇回收装置的投产,降低了甲醇精馏装置的消耗和生产成本,减轻了环境污染保护了环境,同时通过回收甲醇取得了很好的经济效益。 相似文献
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从甲醇合成反应不可避免地生成各种杂质谈起,对大型甲醇装置残液回收、杂醇油按组分进行有效分割和精密精馏提纯作了简单分析和探讨,得出了建设甲醇残液回收和杂醇油精密精馏装置必要性的结论,给出了概略的投资和经济效益估算,供同业参考。 相似文献
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粗甲醇精馏过程中产生的残液含甲醇约为5%。采用本文所述工艺从残液中回收甲醇,可使其中甲醇含量降至0.8~1.2%,既可取得一定的经济效益,又可减轻环境污染。 相似文献
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介绍了青岛海晶化工集团有限公司采用无溢流筛板塔式汽提装置回收PVC树脂中残留的氯乙烯单体的工艺流程、所选择的汽提塔运行参数与运行中出现的问题.该工艺可使汽提塔出塔浆料中氯乙烯单体残留量达到5 μg/g,PVC树脂中的氯乙烯单体残留量达到1 μg/g,具有显著的经济效益和社会效益. 相似文献
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根据CO2汽提法和氨汽提法尿素生产工艺技术的不同特点,以2套80万t/a尿素装置为例,分别采用不同的汽提方法进行工程项目设计,从工艺流程、设备布置、管道配置和材料选用等方面对CO2汽提法与氨汽提法尿素生产工艺进行了比较和探讨。 相似文献
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The stripping of methanol from wastewater was studied in a trickle-bed reactor packed with a mixture of hydrophobic catalyst and hydrophilic support. The process involves air stripping of methanol followed by a gas phase oxidation of methanol into CO2 and H2 O over a platinum catalyst. At temperatures between 25 and 70°C, the overall rate was found to be controlled by the stripping step. Since the oxidation results in a lower concentration of methanol in the gas phase, the increased driving force for interfacial mass transfer leads to higher overall methanol removal efficiency. 相似文献
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The Herter process is a patented enhanced oil recovery process that proposes the use of a fatty acid as a solvent to recover petroleum from an oil reservoir or a tar sand. The fatty acid solvent is injected into a reservoir formation or mixed with a tar sand in order to reduce the viscosity and increase the mobility of the petroleum.
The recovery and recycle of the fatty acid solvent are fundamental parts of the process. The Herter process proposes to recover the fatty acid by saponification, migration of the soap to the aqueous phase, and desaponification of the resulting soap phase. However, the formation of a hydrocarbon-soap-water emulsion severely limits the proposed process. Addition of methanol limits emulsification to allow a meaningful separation to be accomplished.
An evaluation of two proposed revisions to the Herter process was made based on batch experiments involving the recovery of oleic acid, linolenic acid, and Georgia Pacific XTOL™304 fatty acid from solvated mixtures with n-heptane. In both of these methods, methanol was introduced to the process as a cosolvent for the saponifying base (sodium hydroxide). The two methods differed in the manner of methanol recovery. In method 1, the saponification heavy phase was distilled to recover methanol. In method 2, the desaponification heavy phase was distilled to recover methanol.
Both of these methods had fatty acid recoveries greater than 84%, n-heptane recoveries greater than 89%, and methanol recoveries greater than 67%. Method 1 recovered purer fatty acid and a slightly greater percentage of n-heptane. Method 2 recovered a greater percentage of both fatty acid and methanol. Method 2 was found to be superior when high purity of the recovered fatty acid product was not required. 相似文献
The recovery and recycle of the fatty acid solvent are fundamental parts of the process. The Herter process proposes to recover the fatty acid by saponification, migration of the soap to the aqueous phase, and desaponification of the resulting soap phase. However, the formation of a hydrocarbon-soap-water emulsion severely limits the proposed process. Addition of methanol limits emulsification to allow a meaningful separation to be accomplished.
An evaluation of two proposed revisions to the Herter process was made based on batch experiments involving the recovery of oleic acid, linolenic acid, and Georgia Pacific XTOL™304 fatty acid from solvated mixtures with n-heptane. In both of these methods, methanol was introduced to the process as a cosolvent for the saponifying base (sodium hydroxide). The two methods differed in the manner of methanol recovery. In method 1, the saponification heavy phase was distilled to recover methanol. In method 2, the desaponification heavy phase was distilled to recover methanol.
Both of these methods had fatty acid recoveries greater than 84%, n-heptane recoveries greater than 89%, and methanol recoveries greater than 67%. Method 1 recovered purer fatty acid and a slightly greater percentage of n-heptane. Method 2 recovered a greater percentage of both fatty acid and methanol. Method 2 was found to be superior when high purity of the recovered fatty acid product was not required. 相似文献
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传统21法是针对我国传统法尿素工艺存在的问题,在汲取了ACES 21法和NH3汽提法两流程优点的基础上组合而成的技术改造流程,属于提高第一分解回收段压力的汽提法技改方案。论述了该技改方案的技术基础、流程选择、化工过程、技术关键,以及传统21法的技术特点和工艺流程。作者提出了由传统21法工艺技术和DCS 3个高级控制系统组合而成的提升我国传统法尿素装置的技改方案。 相似文献
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传统21法是针对我国传统法尿素工艺存在的问题,在汲取了ACES21法和NH3汽提法两流程优点的基础上组合而成的技术改造流程,属于提高第一分解回收段压力的汽提法技改方案。论述了该技改方案的技术基础、流程选择、化工过程、技术关键,以及传统21法的技术特点和工艺流程。作者提出了由传统21法工艺技术和DCS+3个高级控制系统组合而成的提升我国传统法尿素装置的技改方案。 相似文献
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胶乳汽提脱除单体的机理及数学模型 总被引:1,自引:0,他引:1
本文研究了丁苯吡胶乳的脱气机理,实验证明了这个包括有多个传质阶段的复杂传质过程是由单体从胶粒内扩散到表面并穿过界面进入液相的传质阶段所控制。从这一机理出发,选择了脱气过程的工艺条件。通过简化脱气过程的物理模型,从理论上推导出脱气过程的数学模型,并用实验证实了这一模型。通过对多种胶乳及各种脱气设备的应用,证明该模型具有普遍性。本文提出用定义的脱气速度常数来研究和设计脱气过程的方法。 相似文献