Method for azeotropy dehydration for circulation solvent in extraction separation diene by C5
A technology of circulating solvent and azeotropic dehydration, applied in azeotropic distillation, extractive distillation, distillation purification/separation, etc., can solve the problems of large refining unit load, large equipment investment, and high solvent loss
Active Publication Date: 2009-12-30
ZIBO LUHUA HONGJIN NEW MATERIAL CO LTD
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Problems solved by technology
In the prior art, the equipment investment is large, and the solvent is extracted from the second stripping tower to be refined, and the load of the refining unit is large, resulting in high solvent loss
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[0017] Attached below Figure 1-3 The method for using azeotropic dehydration of the circulating solvent in the C5 extraction and separation of diolefins of the present invention is further described:
[0018] refer to figure 1 :
[0019] The material enters the primary extraction and stripping tower 1 through the feed port 6. The tower is designed to have 50-60 plates, and the pressure at the top of the tower is 0.02MPa. Use a guide float valve to improve the plate efficiency, or use a common float valve. The temperature value of the 28th plate of the first extraction stripper 1 is designed as a process control point. After calculation, the plate temperature can be controlled at >90°C to achieve the purpose of azeotropic dehydration, so the temperature inside the first extraction stripper 1 is 90 ~120°C, the solvent water content in the bottom of the tower meets the control requirements, the design margin of the condensate tank 4 on the top of the first stripping tower 1 is...
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The invention relates to a method for extracting and separating diolefins from C5 hydrocarbons by solvent circulation and azeotropic dehydration, pertaining to the preparation technology of extracting and separating isoprene from DMF. The invention is characterized in that: by employing a single tower, materials are sent into an extracting tower (1) from a feed port (6); at the temperature of 90-120 DEG C and tower top pressure of 0.02MPa, the azeotropic dehydration is carried out; and then the obtained material is taken out of a discharge port (7). In the process of employing the DMF method to separate diolefins from C5 components, the azeotropic dehydration method is adopted, which ensures that water containing in the extracting circulation solvent meet requirement; the water content is less than 500PPm, thus lowering the investment of equipment by reducing a tower system and an attachment heat exchanger, a machine pump and a liquid curing tank, and technology control difficulty is reduced; besides, the invention can guarantee that the water content in the circulation solvent meets requirements and the process of C5 separation can be carried out smoothly.
Description
technical field [0001] The method of using azeotropic dehydration to circulate solvent in C5 extraction and separation of diolefins belongs to the preparation process of DMF extraction and separation of isoprene. Background technique [0002] In the process of producing ethylene from petroleum cracking, a considerable amount of carbon five fractions are produced by-products, and the carbon five fractions contain about 40-60% of diolefins such as isoprene, cyclopentadiene, and piperylene. These diolefins The chemical properties are active, and it is an important raw material for many fine chemical products. Therefore, the separation and utilization of C5 fractions are very meaningful for improving the economic benefits of ethylene plants and comprehensively utilizing petroleum resources. However, the C5 fraction is composed of more than 30 components with similar boiling points and easy to form azeotropes with each other. In order to separate various diolefins with higher pur...
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IPC IPC(8): C07C7/08C07C7/00C07C11/18B01D3/36B01D3/40
Inventor 赵新来姜东成张宗龙毛思扬王林赵晓华
Owner ZIBO LUHUA HONGJIN NEW MATERIAL CO LTD