Process method and equipment for refining, extracting and distilling cyclopentane

Abstract

The invention relates to a process method and equipment for refining, extracting and distilling cyclopentane. The problem in the background art that the cyclopentane and a 2, 2-dimethylbutane system are difficult to effectively separate to influence the purity of a cyclopentane product is mainly solved. The equipment for refining, extracting and distilling the cyclopentane comprises an extracting and distilling tower (2) and a desorption tower (3), and a weight-removing tower (1) is additionally arranged in the front of the extracting and distilling tower (2). The process method for refining, extracting and distilling the cyclopentane adopts N, N-dimethyl formamide as an extracting agent in the extracting and distilling tower. By using the process method, two products, namely the cyclopentane and 2, 2-dimethylbutane can be effectively separated through an extractive distillation technique; the purity of a cyclopentane product is not less than 99.2% (mol percentage); the energy consumption of the towers is decreased; and the cyclopentane product with higher purity is produced.

Description

technical field [0001] The invention relates to an extractive distillation process and its equipment in the field of petrochemical industry, in particular to a cyclopentane refining extractive distillation process and its equipment. Background technique [0002] The purity of the cyclopentane produced by the cyclopentane plant of the fine chemical plant is low, which seriously restricts the market price of the product. The key component affecting the purity of cyclopentane product is 2,2-dimethylbutane. The atmospheric boiling points of cyclopentane (CP) and 2,2-dimethylbutane (22MB) are 49.25 and 49.74°C respectively, with a difference of 0.49°C, which belong to near-boiling systems. The linear relationship intersects at a temperature of 49.4°C and a composition of ~45 mol% to form an azeotrope. [0003] In industry, the extraction method is commonly used to separate the azeotropic system. The extraction method needs to screen the extractant experimentally to improve the ...

AI Technical Summary

Problems solved by technology

Solvent selection itself is not very difficult, because the polarity and molecular size of the cyclopentane / 2,2-dimethylbutane system are very similar, so it is difficult to find a high-efficiency extractant, and due to the cyclopentane / 2,2-dimethylbutane system The composition of pentane is already as high as 95.88%, so the amount of solvent used is extremely large, and the loss of cyclopentane product will also be large

At the same time, from the perspective of equipment efficiency, production experience and other operational aspects, the production performance of the extraction equipment is very low, and too tall towers cannot be built, so it is not suitable for the separation of the cyclopentane / 2,2-dimethylbutane system

Images