A kind of equipment and method for extracting refined N2O from tail gas of petrochemical industry

Abstract

The invention discloses a device for extraction and refinement of N2O from petrochemical industrial tail gas. The device includes a chemical purification apparatus, a compression cooling apparatus, a physical purification apparatus, a gas separation apparatus and a product collection apparatus that are sequentially connected through a pipeline. The compression cooling apparatus comprises a compressor and a water cooler, the physical purification apparatus is a molecular sieve purifier, the gas separation apparatus comprises a heat exchanger, a throttle valve, a fractionating tower and an expansion machine, and the gas collection apparatus is a gas reservoir. In addition, the invention provides a method for extraction and refinement of N2O by the device. The raw material gas is subjected to chemical purification, dedusting and dewatering, compression cooling, physical purification and low temperature rectification so as to obtain the N2O product. The method and device provided by the invention have the advantages of energy saving and emission reduction, lower cost than traditional N2O preparation technology, high productivity, and greatly enhanced safety factor, unique process, and strong operability. Also, the prepared N2O product has high purity, and can meet the market demand and be exported abroad.

Description

technical field [0001] The invention belongs to the technical field of chemical substance recovery, and in particular relates to a method for extracting and refining nitrogen from petrochemical industry tail gas. 2 O Apparatus and Methods. Background technique [0002] Nitrous oxide, also known as nitrous oxide, has the molecular formula N 2 O, commonly known as "laughing gas", is a gas that has an anesthetic effect on human nerves. [0003] N 2 The boiling point of O is 88.49°C. It is colorless and has a sweet taste. It is a gaseous oxidant, but it can be decomposed into oxygen and nitrogen at temperatures above 600°C. It is very stable at room temperature. [0004] The nitrous oxide / alcohol dual agent is currently the hottest topic in the international aerospace industry. In recent years, many foreign manned spacecraft have been launched using this propellant. [0005] N 2 O was first used in dental analgesia, and now it is extended to painless childbirth and painless...

AI Technical Summary

Problems solved by technology

The production capacity of this traditional process is very low, and the monthly production capacity of a single device is basically 50 tons, and it requires a huge investment in equipment: a Taiwan-funded enterprise in Zhenjiang invested 40 million yuan ten years ago to form the largest domestic production capacity of 50 tons per month. Scale; the production cost of traditional craft products is very high: the cost of the Taiwan-funded enterprise to produce 95% pure pharmaceutical grade products is 8,000 yuan per ton, and the cost to produce 99.999% high purity grade products is 13,400 yuan per ton

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