Hydrolysis process of methyl acetate as by-product of producing refined terephthalic acid and apparatus thereof

A technology of purified terephthalic acid and methyl acetate, which is applied in the field of separation and purification of methyl acetate hydrolyzate and removal of impurities, and can solve problems such as failure to obtain high value-added utilization, impact on production operations, and discharge of methyl acetate , to achieve significant energy-saving effects, save energy consumption, and reduce pollution

Inactive Publication Date: 2008-09-17
FUZHOU UNIV
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Problems solved by technology

However, the methyl acetate in the reaction system will continue to accumulate, which will affect the production operation, and finally cause a part of the methyl acetate to be discharged into the atmosphere along with the tail gas of the PTA production system, causing environmental pollution; Can be recycled, but due to its limited use and low purity, it cannot be used with high added value

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  • Hydrolysis process of methyl acetate as by-product of producing refined terephthalic acid and apparatus thereof
  • Hydrolysis process of methyl acetate as by-product of producing refined terephthalic acid and apparatus thereof
  • Hydrolysis process of methyl acetate as by-product of producing refined terephthalic acid and apparatus thereof

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[0037] Figure 1, figure 2 , image 3 , Figure 4 , Figure 5 , Image 6 , Figure 7 As shown, it constitutes a process flow and a complete set of devices and equipment for catalytic rectification and hydrolysis of by-product methyl acetate in PTA production. Schematic diagram 1 is a further invention based on the catalytic rectification and hydrolysis process of methyl acetate in the polyvinyl alcohol system. In the flow process, there is a catalytic distillation column T-101 with a catalytic active protection column T-101-1 and a water extractor The extractive distillation tower T-103 of T-103-1 is two important equipments of the present invention.

[0038] Methyl acetate from the PTA production system first enters the catalyst activity protection column T-101-1 to remove trace metal ions that may be brought in the system and achieve the purpose of protecting the catalyst activity in the catalytic rectification tower. The structure of the catalyst activity protection co...

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Abstract

The present invention discloses technological process and apparatus for hydrolyzing methyl acetate as the side product of refined terephthalic acid production. The technological process includes the following steps: the mixing between methyl acetate through active catalyst protecting column and methyl acetate through eliminating organic impurity and the catalytic hydrolysis reaction in the reaction area filled into cationic exchange resin inside the catalytic rectification tower; refluxing the un-hydrolyzed reactant in controlled ratio to the reaction area; and pumping out the liquid hydrolysate. The corresponding hydrolysis apparatus is one cylindrical tower in the diameter greater than 0.5 m and height greater than 20-24 m, and its catalytic rectification section has one catalyst bed layer in 6 m over thickness and comprising intersected catalyst structure units. The present invention can realize industrial scale hydrolysis of methyl acetate in required hydrolysis rate within 50-80 wt%.

Description

Technical field: [0001] The invention relates to an industrialized heterogeneous catalytic rectification hydrolysis process of by-product methyl acetate in the production of purified terephthalic acid (PTA) and catalytic rectification equipment used in the hydrolysis process, as well as the separation and purification of methyl acetate hydrolyzate and the removal of impurities process and technology. Background technique: [0002] The raw material methyl acetate used for hydrolysis is a by-product in the production process of polyvinyl alcohol, terephthalic acid and isophthalic acid. The by-product has a low boiling point, is volatile, and has limited industrial use. Generally, it is decomposed into important chemical raw materials by hydrolysis: acetic acid and methanol. There are many methods for its hydrolysis, such as alkaline hydrolysis, acid hydrolysis and cation exchange resin catalyzed hydrolysis. [0003] At present, in the production process of polyvinyl alcohol ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C27/02C07C31/04C07C53/08
CPCY02P20/10
Inventor 王良恩赵之山邱挺赵素英郑辉东丘添荣苏文瑞谢永鸿罗德华
Owner FUZHOU UNIV
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