Device for rectifying and producing high-purity ethylene using ethylene heat pump, and high-purity ethylene production technology

Abstract

The invention relates to a device for rectifying and producing high-purity ethylene using an ethylene heat pump, and a high-purity ethylene production technology. The device comprises a feed solution tank and a product tank. The feed solution tank is connected to a second gas-liquid separator through a first feed solution inlet of a first rectifying tower, a gas phase outlet of the first rectifying tower, a first feed gas inlet of a first heat exchanger, a first feed gas outlet of the first heat exchanger, an inlet of a first gas-liquid separator, a liquid phase outlet of the first gas-liquid separator, a second feed solution inlet of the first rectifying tower, a liquid phase outlet of the first rectifying tower, a first feed solution inlet of a second rectifying tower, a gas phase outlet of the second rectifying tower, a second feed gas inlet of the first heat exchanger, and a second feed gas outlet of the first heat exchanger, and the liquid phase outlet of the second gas-liquid separator is connected to the second feed solution inlet of the second rectifying tower and the product tank. The device has the advantages of simple technological process, stable operation, low energy consumption, safe and reliable operation, low unit power consumption, low production cost and high product purity.

Description

technical field [0001] The invention belongs to the technical field of producing high-purity ethylene, and in particular relates to a device and a production process for producing high-purity ethylene by ethylene heat pump rectification. Background technique [0002] 1. Recovery of ethylene from coke oven gas: It is a method of industrial production of ethylene that started in the 1940s and was eliminated in the 1960s. Typically coke oven gas contains about 2% ethylene. The concentrated sulfuric acid method was first used to separate ethylene from coke oven gas, that is, sulfuric acid was used to convert ethylene into ethanol, and then ethylene was obtained by catalytic dehydration. The ethylene produced by this method has many impurities and low purity. Later, a British company successfully developed a coke oven gas low-temperature separation method. Subsequently, German companies also built several sets of low-temperature separation hydrogen production units and ethylene...

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Problems solved by technology

This method has a wide range of sources of raw materials, and it is also the most widely used method at present, but it can only separate ethylene with a purity of about 99%, and cannot achieve high purity

[0006] 5. High-purity ethylene production process using ethylene as raw material (low-temperature rectification method). This process mainly utilizes the difference in relative volatilities of each component of the raw material gas. The purity can reach 99.99%, but the traditional low-temperature distillation method for purifying ethylene has defects. The product purity is directly proportional to the equipment investment. In addition, the thermal efficiency of the rectification is low during the rectification process, resulting in a waste of energy and an increase in production costs. high

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