A 4,6-dihydroxypyrimidine reaction system tail gas treatment process
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A technology of dihydroxypyrimidine and reaction system, which is applied in the field of tail gas treatment technology of 4,6-dihydroxypyrimidine reaction system, can solve the problems of incomplete recovery, unsafe, waste of resources, etc., and achieves alleviation of air pollution, good safety performance, The effect of less equipment
Active Publication Date: 2018-11-16
石家庄杰克化工有限公司
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Problems solved by technology
With the increasingly serious environmental protection situation, the extensive treatment of such gases can no longer meet the environmental protection requirements, and at the same time it has attracted more and more attention from production units. The useful components in the tail gas of pyrimidine production process are relatively high. If it can be effectively recycled, it will definitely Bring greater economic benefits to the enterprise, but there are factors such as incomplete recycling, waste of resources and unsafety in the conventional treatment process, so it is urgent to find a more efficient and safe treatment process
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Embodiment 1
[0019] Embodiment 1, as figure 1 Shown, the specific operation steps of described technology are as follows:
[0020] A. Methanol recovery: the tail gas of the 4,6-dihydroxypyrimidine reaction system containing 5.36% methanol and 0.91% ammonia is 750m 3 The flow rate of / h is input into the condenser 1, and the temperature in the condenser 1 is lowered to -5°C-0°C with low-temperature cold water, the gaseous methanol in the tail gas is condensed into liquid methanol, and the liquid methanol is diverted to the receiving tank 2 for collection, and then Liquid methanol is delivered to the methanol raw material tank 3, and 600kg of methanol is recovered every day;
[0021] B, nitrogen protection: the tail gas after removing methanol is input in the surge tank 4, and nitrogen is input into the surge tank 4 by the nitrogen supply equipment 12, so that the pressure in the surge tank 4 remains at 0.02-0.03MPa;
[0022] C, ammonia recovery: the tail gas output by the surge tank 4 is ...
Embodiment 2
[0024] Embodiment 2, the specific operation steps of described technique are as follows:
[0025] A. Methanol recovery: the tail gas of the 4,6-dihydroxypyrimidine reaction system containing 4.87% methanol and 0.74% ammonia is 800m 3 The flow rate of / h is input into the condenser 1, and the temperature in the condenser 1 is lowered to 0°C-5°C with low-temperature cold water, the gaseous methanol in the tail gas is condensed into liquid methanol, and the liquid methanol is diverted to the receiving tank 2 for collection, and then Liquid methanol is delivered to the methanol raw material tank 3, and 450kg of methanol is reclaimed every day;
[0026] B, nitrogen protection: the tail gas after removing methanol is input in the surge tank 4, and nitrogen is input in the surge tank 4, so that the pressure in the surge tank 4 remains at 0.02-0.025MPa;
[0027] C, ammonia recovery: the tail gas output by the surge tank 4 is delivered to the first-level falling film absorber 5, the f...
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Abstract
The invention relates to a 4,6-dyhydroxy pyrimidine reaction system tail gas treatment process, and belongs to the technical field of chemical product recycling. The process comprises the steps that firstly, tail gas is conveyed into a condenser, gaseous formaldehyde is converted into liquid formaldehyde through low-temperature condensation to be collected, and the tail gas obtained after the formaldehyde is removed is conveyed into a stabilization tank and subjected to stabilization introducing pressure maintaining; the rear end of the stabilization tank is sequentially connected with two stages of falling film absorbers, each falling film absorber is connected with an absorption liquid circulating tank for providing absorption liquid, the absorption liquid circulating tanks absorb ammonia in the tail gas, and then the tail gas enters an incinerator to be incinerated. In the whole technological process, equipment is simple, operation is easy and convenient, no high-temperature high-pressure equipment exists, the safety coefficient is high, the formaldehyde and ammonium hydroxide can be recycled in the tail gas treatment process, formaldehyde in production raw materials is supplemented, and the ammonium hydroxide can be sold as chemical materials; in the tail gas treatment process, the work environment is improved, and atmospheric pollution is relieved.
Description
technical field [0001] The invention belongs to the technical field of chemical product recovery, and in particular relates to a tail gas treatment process of a 4,6-dihydroxypyrimidine reaction system. Background technique [0002] During the pyrimidine production process, there are problems such as high methanol concentration of combustible gas, strong ammonia smell, and high production safety risks when the tail gas is discharged. The traditional tail gas treatment and recovery system is to simply condense the tail gas to obtain part of the liquid alcohol and then discharge it. As the environmental protection situation becomes more and more serious, the extensive treatment of such gases can no longer meet the environmental protection requirements, and at the same time, it has attracted more and more attention from production units. The useful components in the tail gas of pyrimidine production process are relatively high. It brings great economic benefits to the enterpris...
Claims
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Application Information
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