Method for producing high-purity cyclopentadiene and cyclopentane by coarse piperyene

Abstract

The invention discloses a method for preparing cyclopentene and cyclopentene of high purity by using coarse pentadiene got from petroleum cracking ethylene by-product carbon five separation. Feeding the coarse pentadiene into extraction tower in existence of polymerization inhibitor, getting mixing material of cyclopentene and cyclopentane in the tower top, extracting agent and pentadiene being in the tower still; feeding the material got in tower top to the first fractionating tower, stipping light component in tower top, getting mixing material of cyclopentene and cyclopentane in the tower still; feeding the material got from the first fractionating tower still into the second fractionating tower, getting cyclopentene of above 99% in tower top, and cyclopentane in tower still; feeding the material got from the second fractionating tower still into the third fractionating tower, steeping the heavy component in the tower still and getting the cyclopentane product in tower top. The invention employs extractive distillation method and is characterized by the high extraction accuracy, stable product quality and easy for industrial production.

Description

(1) Technical field

[0001] The invention relates to a method for producing high-purity cyclopentene and cyclopentane, in particular to a method for producing high-purity cyclopentene and cyclopentane by using crude piperylene obtained by separation of carbon five, a byproduct of ethylene from petroleum cracking . (2) Background technology

[0002] In the process of producing ethylene from petroleum cracking, the by-product C5 accounts for 12%-14%. In 2005, my country's ethylene processing capacity reached 7.5 million tons, and more than 1 million tons of C5 by-products were produced. Since the C5 fraction contains diolefins such as isoprene, cyclopentadiene and piperylene, these diolefins are chemically active and are very important chemical raw materials. The development and utilization of these three diolefins is relatively early in foreign and domestic countries, especially isoprene and cyclopentadiene (dicyclopentadiene) are widely used, because the purity of piperylene is us...

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