SU900794A3

SU900794A3 - Process for purifying cases from hydrogen sulfide and carbon dioxide impurities

Info

Publication number: SU900794A3
Application number: SU762414915A
Authority: SU
Inventors: Фрэнсиз Батвелл Кеннет
Original assignee: Юнион Карбид Корпорейшн (Фирма)
Priority date: 1976-09-17
Filing date: 1976-10-29
Publication date: 1982-01-23

Description

Изобретение относитс к способам абсорбционной О1 истки газов от кислых компонентов и может найти применение в химической и газовой отрасл х промышленности.5The invention relates to O1 absorption methods for the generation of gases from acid components and can be used in the chemical and gas industries.

Известен способ очистки газов от примесей сероводорода и двуокиси углерода путем контактировани с водным раствором алканоламина при С. Причем алканоламин выбран 10 из числа моно-, ди- и триэтаноламина , мет илди этанол амина и т.д. 1 .A known method of purifying gases from hydrogen sulphide and carbon dioxide impurities by contacting with an alkanolamine aqueous solution at C. Moreover, 10 alkanamines have been selected from among mono-, di-, and triethanolamine, methyldi ethanol amine, etc. one .

Недостатком этого способа вл етс то, что абсорбци примесей сероводорода и двуокиси углерода ij протекает одновременно и избирательность извлечени невелика.The disadvantage of this method is that the absorption of impurities of hydrogen sulfide and carbon dioxide ij occurs simultaneously and the selectivity of extraction is small.

Наиболее близким к изобретению по технической сущности и достигаемому результату вл етс способ очист-20 ки газов от примесей сероводорода и двуокиси углерода путем противоточного контактировани с водным раствором алканоламина при и скорости газового потока 3 м/с. Конт ктиро- 25The closest to the invention in technical essence and the achieved result is a method for purifying gas from hydrogen sulphide and carbon dioxide impurities by means of countercurrent contact with an aqueous solution of alkanol amine at a gas flow rate of 3 m / s. Comte 25

вание осуществл ют в многотарельчатой абсорбционной колонне 2.The operation is carried out in a multi-plate absorption column 2.

Недостатком известного способа вл етс недостаточно высока селективность извлечени сероводорода из газовой смеси, котора равна 9 единицам при мол рном соотношении CojHjS 2,37: 10,36, 30°С и скорости газового потока 2,5 м/с.The disadvantage of this method is that the selectivity of hydrogen sulfide extraction from the gas mixture is not high enough, which is equal to 9 units with a molar ratio of CojHjS 2.37: 10.36, 30 ° C and a gas flow velocity of 2.5 m / s.

Целью изобретени вл етс повышение селективности извлечени сероводорода .The aim of the invention is to increase the selectivity of the extraction of hydrogen sulfide.

Claims

The goal is achieved; the method of gas purification from the use of this hydrogen sulfide and carbon dioxide by countercurrent contact with an aqueous solution of alkanolamine, in which the contacting is carried out in 2-10 absorption zones at a gas flow rate of 0.1-2.5 m / s "(water 0.3 mole acid gas per 1 mole of alkanolamine at each step of the process 39 Example: At each of the 10 absorption zones, the absorber is a sieve tray contactor with sieve plates without partitions and a drain hole, the plates are 0.15 m. The absorber has a diameter of 3.6 inches. Methanol diethanolamine () is used as alkanolamine. The polarity of the MDEA solution fed to each absorption step is 8, corresponding to 50 ppm of MDEA and 50 ppm of water The feed gas is a mixture nitrogen, carbon dioxide, hydrogen sulphide and water vapor. The feed gas is saturated and contains mostly no impurities. The concentration of CO2 is 15 vol.1. The molar ratio of CO. and 2 p of hydrogen sulfide is +1: 1, the process temperature is 32 ° C. The regeneration of the saturated absorber is carried out at a pressure of 2 kg / cm and the temperature at the outlet of the absorption column is. The absorber has 3 and 6 absorption zones. The gas flow rate of 1, 5 m / s. The hydrogen sulfide content is reduced from 6 to 0.1%. Selectivity is 5 units. The invention allows a very high degree of removal of hydrogen sulphide from a gas stream containing carbon monoxide, including gases containing very dilute concentrations of hydrogen sulfide. At the same time, the selectivity of hydrogen sulfide recovery increases from 9 units to I, 5 units (the ratio of COj; H.jS in the source gas is 16: 1, the temperature is 32 ° C, the gas velocity is less than 1.5 m / s), i.e. by 60%. In addition, the polluted ttJ product is suitable for further industrial processing, for example, the production of elemental sulfur. Claims The method of purifying gases from hydrogen sulphide and carbon dioxide impurities by countercurrent contact with an aqueous alkanolamine solution, characterized in that, in order to increase the selectivity of hydrogen sulphide recovery, contacting is carried out in 2-10 absorption zones at a gas flow rate of 0.1-2 , 5 m / s, with the removal of the absorption solution with a concentration of 0.3 mol of acid gas per mole of alkanolamine at each stage of the process. Sources of information taken into account during the examination 1. A. Koul. and Rizenfeld, F.S. Gas cleaning. M., Nedra, 1968, p. .

2. Canadian patent ff (5, cl. 23-3 6, published 197 (prototype),