Liquid ammonia production method
A production method and liquid ammonia technology, which is applied in the field of producing liquid ammonia from crude ammonia gas, to achieve the effects of eliminating pollution problems, ensuring life, health and safety, and saving one-time investment
Active Publication Date: 2014-11-19
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0007] The present invention aims at the above-mentioned problems caused by the presence of ammonia compressors in the existing methods of producing liquid ammonia from crude ammonia, and provides a new method for producing liquid ammonia. The production process does not use ammonia compressors, and the production process is safer and more reliable. No secondary pollution to liquid ammonia
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[0026] A specific embodiment of a liquid ammonia production method of the present invention will be further described below in conjunction with the accompanying drawings.
[0027] The crude ammonia gas 1 enters the first-stage partial condenser 2 to remove the liquid therein and then is cooled by the first-stage cooler 3 . The temperature of the primary decondenser 2 is 120-200°C, and the pressure after de-condensation is 0.6-2.0MPa; the primary cooler 3 is a plate or shell-and-tube heat exchanger, and the cooling medium is water, and the temperature of ammonia gas after condensation is 90-150 ℃, into the secondary partial condenser 4. The pressure of the secondary decondenser 4 is 0.55~1.5MPa after decondensation; the ammonia gas after decondensation enters the secondary cooler 5 for cooling, and the secondary cooler 5 is a plate or shell-and-tube heat exchanger, and the cooling medium is water. The final ammonia temperature is 30-60°C and enters the three-stage partial cond...
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The invention discloses a liquid ammonia production method which comprises the following steps of: (A) performing three-level segregation of crude ammonia gas to remove most of water and hydrogen sulfide therein, wherein the conditions of the three-level segregation are as follows: the temperature of the first-level segregation is 120-200 DEG C, and the pressure after the segregation is 0.6-2.0MPa; the temperature of the second-level segregation is 90-150 DEG C, and the pressure after the segregation is 0.55-1.5MPa; and the temperature of the second-level segregation is 30-70 DEG C, and the pressure after the segregation is 0.5-1.0MPa; (B) cooling the segregated ammonia gas to (-30)-20 DEG C to convert the ammonia gas into liquid ammonia; (C) increasing pressure of the liquid ammonia to 1.3-3.0MPa; and (D) removing water and hydrogen sulfide of the liquid ammonia in a desulfurization dehydrator at the same time, wherein the operation temperature of the desulfurization dehydrator is (-30)-50 DEG C, and the operation pressure is 1.3-3.0MPa. The invention provides a new liquid ammonia production method. An ammonia compressor is not used in the production process, the production process is safer and more reliable, and secondary pollution to the liquid ammonia is avoided.
Description
technical field [0001] The invention belongs to a liquid ammonia production method applied to an acidic water stripping device of a refinery, and can also be used in other fields of producing liquid ammonia with crude ammonia gas. Background technique [0002] In the process of crude oil processing in refineries, atmospheric and vacuum, catalysis, coking, reforming, hydrogenation and other devices will produce acidic wastewater containing hydrogen sulfide and ammonia, and steam stripping is usually used to treat these acidic wastewater. During the steam stripping process, acid gas mainly containing hydrogen sulfide flows out from the top of the stripping tower, purified water flows out from the bottom of the tower, and crude ammonia gas is extracted from the side line in the middle of the tower. [0003] The main components of the crude ammonia extracted from the side line are water, ammonia and hydrogen sulfide. The water content is generally 70-80% by weight, and the weigh...
Claims
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IPC IPC(8): F25J3/06C01C1/02
Inventor 王占顶汤红年王刻文
Owner CHINA PETROLEUM & CHEM CORP