Method for producing polymerization level isoprene with one-section abstraction combined azeotropy distillation
A technology of isoprene and azeotropic distillation, applied in extraction and purification/separation, distillation purification/separation, organic chemistry, etc., can solve the problems of large solvent loss, difficult operation, easy clogging, etc., and achieve easy operation and operation The effect of simplicity and less equipment
Active Publication Date: 2010-05-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0005] Aiming at the problems of high energy consumption, difficult operation, easy blockage, large solvent loss and unsafety in the existing second extraction unit, the present invention proposes a method for one-stage extraction and rectification to separate and crack C5 fractions. The method utilizes rectification The method removes cyclopentadiene and uses azeotropic distillation to remove alkynes, and the product of polymer grade isoprene can be obtained without a second extraction unit
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Embodiment 1
[0043] The cracked C5 fraction of Yanshan Petrochemical Company is used as the raw material, and the separation method of the present invention is used to separate the cracked C5 fraction. The composition of the raw material and the composition of the incoming and outgoing materials of each operating device are listed in the following table.
[0044] (1) Pretreatment unit: 31,000kg / h of cracked C5 fraction enters the middle part of the pre-light removal tower T-101. The pre-light removal tower T-101 has 80 theoretical plates, the reflux ratio is 22, and the tower top temperature is 45°C , remove the light components containing C4, alkynes and alkanes from the top of the tower, and the materials extracted from the tower reactor enter the dimerization reactor R-101, and carry out the dimerization reaction at 80-85°C to make the cyclopentyl Diene is dimerized into dicyclopentadiene, and then enters the pre-weight removal tower T-102. The pre-weight removal tower T-102 has 85 theor...
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Abstract
The invention relates to a method for preparing polymerization grade isoprene by a section of extraction, combination, azeotropy and distillation which belongs to the technical field of separating 5 carbon stream, provides a method of a section extracting, rectifying, separating and cracking 5 carbon stream in order to solve the problems of a second extraction unit in the existing carbonium 5 separation process, such as high energy consumption, complex operation, harsh operation demand and big extraction solvent loss, etc.; the method adopts a distillation method to remove isoprene and uses anazeotropy distillation method to remove alkyne; a polymerization grade isoprene product is obtained with no need of two times extraction and the second extraction unit and a solvent refining tower are omitted. The method for preparing the polymerization grade isoprene by a section of extraction, combination, azeotropy and distillation is simple in operation, easy in operation and low in production cost; the energy consumption of the polymerization grade isoprene product unit of the invention is about 20 percent of the existing second extraction unit in the same treating load of the raw material; m-pentadiene is produced from a pre-deheavy tower kettle and does not enter an extraction and distillation unit; the throughput of the extraction and distillation tower, an absorption tower and ade-heavy tower is reduced by 50 percent with the energy consumption being reduced by 50 percent correspondingly, and construction cost and production cost are greatly reduced.
Description
technical field [0001] The present invention relates to a method for separating C5 fractions, more specifically, the present invention relates to a method for separating and cracking C5 fractions to prepare polymer grade isoprene products. Background technique [0002] In the process of producing ethylene from petroleum cracking, a considerable amount of C5 fraction is by-produced, and the C5 fraction is rich in diolefins such as isoprene, cyclopentadiene and piperylene. These diolefins are chemically active and are important chemical raw materials. Due to the difference in cracking raw materials, cracking depth and separation degree of petroleum hydrocarbons, the content of diolefins in cracked C5 fractions is different, and the total content is between 40% and 60%. Therefore, the separation and utilization of C5 fractions has far-reaching significance for improving the economic benefits of ethylene plants and comprehensively utilizing petroleum resources. [0003] The cr...
Claims
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IPC IPC(8): C07C7/10C07C7/06C07C11/18
Inventor 戴伟田保亮冯海强杨志钢高继东鲁云
Owner CHINA PETROLEUM & CHEM CORP