Processing technology of mixed amine

Abstract

The invention discloses a processing technology of mixed amine, which comprises the following steps: a, reducing the pressure intensity of a mixture containing methylamine and methyldiethanolamine to 1-1.5 MPa through a first pressure reducing valve, introducing the mixture into the bottom of a deamination tower, controlling the temperature of a bottom kettle of the deamination tower to be 135-145 DEG C, allowing methylamine in the mixture to be vaporized and rise to the top of the deamination tower and enter a condenser to be liquefied into liquid methylamine to be recycled, and leaving mixture residual liquid containing N-methyldiethanolamine at the bottom of the tower; b, conducting distilling and separating to obtain crude products of methylamine and N-methyldiethanolamine; c, enabling methylamine separated from the N-methyldiethanolamine crude product in a flash tower to enter an absorption tower and carrying out absorption treatment by using spray liquid; d, separating out an N-methyldiethanolamine product; and e, mixing one or two or more of monoethanolamine, ethylene glycol amine, diisopropanolamine, methyldiethanolamine and triethanolamine to obtain mixed amine.

Description

technical field [0001] The invention belongs to the technical field of chemical product synthesis, and in particular relates to a processing technology of mixed amines. Background technique [0002] During the development of sulfur-containing oil and gas fields, due to the presence of hydrogen sulfide, corrosion and damage to oil pipelines and equipment often occur. At the same time, hydrogen sulfide also seriously threatens personal safety because of its high toxicity. [0003] Hydrogen sulfide is a highly irritating gas with a strong smell of rotten eggs. The presence of hydrogen sulfide in the production process of oil and gas wells will not only cause equipment and pipeline corrosion, catalyst poisoning, but also seriously threaten personal safety. At present, there are many methods for treating hydrogen sulfide waste gas at home and abroad, and desulfurization can be divided into dry method and wet method according to its weak acidity and strong reducing property. The...

AI Technical Summary

Problems solved by technology

[0006] The existing industrial production method of N-methyldiethanolamine is to use ethylene oxide and excess monomethylamine aqueous solution to react, obtain the mixture of N-methyldiethanolamine and reactant and separate monomethylamine aqueous solution through flash evaporation , the N-methyldiethanolamine product is separated by rectification, the content of N-methyldiethanolamine in the product is only about 95%, the consumption of raw materials is large, methylamine is not completely absorbed, and it is emitted in the air to pollute the atmospheric environment, resulting in High alkalinity in sewage pollutes water bodies

The current production process of N-methyldiethanolamine has the technical problems of high raw material consumption, environmental protection and high cost

Images