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Joint production process of alcohol and ammonia

A process, the technology of alcohol ammonia, applied in the direction of inorganic chemistry, non-metallic elements, organic compound preparation, etc., can solve the problems of large energy consumption and energy consumption, and achieve the effect of low operating cost, low cost and short process

Inactive Publication Date: 2010-09-08
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the combustion of the added air, a large amount of hydrogen will be consumed (according to the reaction formula 2H 2 +O 2 =2H 2 (2, 1 volume of oxygen consumes 2 volumes of hydrogen), the reformer must be operated at high temperature, the energy consumption is large, and the conversion and decarburization also consume a lot of energy

Method used

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  • Joint production process of alcohol and ammonia
  • Joint production process of alcohol and ammonia

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Experimental program
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Effect test

Embodiment 1

[0029] In this embodiment, the exhaust gas obtained from the coke oven gas to methanol plant is used as raw material gas to produce synthetic ammonia. The process flow is shown in Figure 2, which mainly includes the following steps:

[0030] (1), the purge gas obtained from the methanol plant is 19712Nm 3 / h at a pressure of 3.2MPa±0.2MPa and normal temperature through a pressure swing adsorption device to produce hydrogen 14302Nm with a hydrogen purity greater than 98% 3 / h, the nitrogen produced by adding the nitrogen produced by the cryogenic air separation unit is 4539Nm 3 / h, to obtain a hydrogen-nitrogen mixture of 18842Nm 3 / h;

[0031] in:

[0032] The composition (vol%) of the purge gas obtained from the methanol plant is: H 2 79.41,N 2 9.89, CO 2.02, CO 2 5.51, CH 4 2.55, CH 3 OH 0.42, Ar 0.04; pressure is 4.6MPa, temperature is normal temperature;

[0033] The product hydrogen composition (vol%) that pressure swing adsorption makes is: H 2 98.5,N 2 ...

Embodiment 2

[0041] In this embodiment, the purge gas obtained from the natural gas to methanol plant is used as raw material gas to produce synthetic ammonia. The process flow is shown in Figure 2, which mainly includes the following steps:

[0042] (1), the purge gas obtained from the methanol plant is 19460Nm 3 / h at 3.2MPa±0.2MPa pressure and normal temperature through a pressure swing adsorption device to produce hydrogen 13464Nm with a hydrogen purity greater than 98% 3 / h, mixed with the nitrogen gas 4391Nm produced by the pressure swing adsorption nitrogen generator 3 / h, to obtain a hydrogen-nitrogen mixture of 17855Nm 3 / h;

[0043] in:

[0044] The composition (vol%) of the purge gas obtained from the methanol plant is: H 2 75.72,N 2 0.28, CO 3.09, CO 2 4.2, CH 4 16.26, CH 3 OH 0.63; pressure is 4.6MPa, temperature is normal temperature;

[0045] The product hydrogen composition (vol%) that pressure swing adsorption makes is: H 2 98.5,N 2 0.3, CO 0.3, CH 4 0.9...

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Abstract

The process of co-producing alcohol and ammonia with the discharged gas from methanol producing apparatus as the material gas includes the following steps: 1. producing hydrogen with purity higher than 98 % in a pressure swing absorption set with the discharged gas, and adding nitrogen from low temperature air separating plant or nitrogen producing pressure swing absorption plant to obtain mixed gas in the H2 / N2 ratio of 3.00-3.10; 2. methanation reaction of H2 and CO in the mixed gas to obtain fresh methane gas; and 3. cooling and pressurizing the fresh methane gas and synthesizing ammonia in an ammonia synthesizing loop, and cooling and separating to obtain liquid ammonia. The process is short, low in cost, and low in power consumption.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing synthetic ammonia by utilizing the purge gas obtained from a methanol plant. Background technique [0002] Synthetic ammonia is a large chemical product in my country, with an output of nearly 50 million tons per year. It is mainly used to manufacture fertilizers (such as urea, ammonium bicarbonate, ammonium phosphate), chemical products (such as methylamine, nitric acid, etc.) and so on. [0003] In the conventional ammonia synthesis technology using natural gas as raw material (the schematic diagram of the process flow is shown in Figure 1), the raw natural gas is usually desulfurized, water vapor is added for one-stage conversion, and air is added for second-stage conversion to obtain hydrogen, carbon monoxide, Synthetic gas of carbon dioxide and nitrogen; after high-temperature shift and low-temperature shift, carbon monoxide is c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/32C07C31/04C07C29/151
Inventor 陶鹏万王晓东冉崇慧黄维柱
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND