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A separation device for ammonia and carbon dioxide

A carbon dioxide and separation device technology, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve problems such as inability to separate, easy crystallization of ammonia and carbon dioxide, etc.

Active Publication Date: 2018-10-30
YASHENTECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] An object of the present invention is to provide a kind of separation device of ammonia and carbon dioxide, this separation device adopts three towers of absorption tower, recovery tower and desorption tower to constitute separation system, adopt this device to separate the mixed gas of ammonia and carbon dioxide, can effectively Solve the problem that ammonia and carbon dioxide are easy to crystallize and cannot be separated, and realize the efficient separation of ammonia and carbon dioxide

Method used

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  • A separation device for ammonia and carbon dioxide
  • A separation device for ammonia and carbon dioxide
  • A separation device for ammonia and carbon dioxide

Examples

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Embodiment 1

[0041] The first embodiment of the present invention relates to the process principle of a separation device for ammonia and carbon dioxide, as shown in the attached figure 1 As shown, the ammonia and carbon dioxide separation process includes: sending the mixed gas containing ammonia and carbon dioxide into a three-tower separation device including an absorption tower 1100, a recovery tower 1200 and a desorption tower 1300 for separation. First, the carbon dioxide absorption step is carried out in the absorption tower 1100: the mixed gas containing ammonia and carbon dioxide is sent into the absorption tower, and at the same time, a carbon dioxide absorbent (hereinafter also referred to as an absorbent) and low boilers are respectively introduced into the absorption tower, and the carbon dioxide absorbent Contains potassium carbonate solution; use a reboiler to heat the tower bottom of the absorption tower, extract ammonia-containing gaseous substances from the top of the abso...

Embodiment 2

[0047] The second embodiment of the present invention relates to a specific method and device for separating ammonia and carbon dioxide. as attached figure 2 As shown: the device for separating ammonia and carbon dioxide in this embodiment includes an absorption tower 2101, an absorption tower reboiler 2112, an absorption tower bottom discharge pump 2131, a recovery tower 2201, a recovery tower reboiler 2212, and a recovery tower condenser 2211, recovery tower reflux tank 2221, recovery tower reflux pump 2231, recovery tower tank discharge pump 2232, desorption tower 2301, desorption tower reboiler 2312, desorption tower condenser 2311, desorption tower reflux tank 2321, desorption tower reflux pump 2331, lean liquid circulating pump 2332, desorption tower kettle discharge cooler 2313.

[0048] In the lower part of the absorption tower 2101, there is a gas-phase feed inlet for the mixed gas to enter, in the upper end and middle part of the absorption tower 2101, there are ab...

Embodiment 3

[0054] The schematic diagram of the separation device involved in the third embodiment of the present invention is as attached image 3 As shown, the ammonia and carbon dioxide separation device of this embodiment is the same as that of Embodiment 2. The difference between the separation method of this embodiment and Embodiment 2 is that the mixed gas to be separated in this embodiment contains ammonia and carbon dioxide, but does not contain It can be used as a low boiler to participate in the components of the separation reaction. In addition, in this embodiment, methyl formate is selected as the low boiler. Specifically the separation method of the present embodiment is as follows:

[0055] The mixed gas of ammonia and carbon dioxide is sent to the middle and lower part of the absorption tower 3101. The absorption tower 3101 is a packed tower with an operating pressure of 0.2 MPa (A). The mass-liquid-gas ratio of the absorbent to the mixed gas is 3:1; the total alkalinity ...

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Abstract

The invention relates to a separation device for ammonia and carbon dioxide. The device successively comprises an absorption tower, a recovery tower and a desorption tower, wherein the tower kettles of the absorption tower, the recovery tower and the desorption tower are respectively provided with a reboiler; in addition, the tower tops of the recovery tower and the desorption tower are connected with reflux condensers. By utilizing the device provided by the invention to separate mixed gas of ammonia and carbon dioxide, the mixed gas is delivered into the absorption tower; the process of carbon dioxide adsorption, the process of low-boiling-point substance recovery and the process of carbon dioxide desorption are successively completed in the absorption tower, the recovery tower and the desorption tower; and finally, separation of ammonia and carbon dioxide is realized. Thus, the separation device provided by the invention can effectively solve the problem of incapability of separation due to easy crystallization of ammonia and carbon dioxide, and improves the recovery rate of carbon dioxide.

Description

technical field [0001] The invention relates to the technical field of removing carbon dioxide from a mixture, in particular to a separation device for ammonia and carbon dioxide. Background technique [0002] A mixture of ammonia and carbon dioxide is produced during the production of urea or the synthesis of melamine from urea. How to efficiently separate ammonia and carbon dioxide from the mixed gas and make them as recycled materials or co-products / by-products plays a crucial role in the efficiency and economy of the production process. [0003] A special property of the mixture of ammonia and carbon dioxide is that the two tend to react spontaneously to form ammonium carbamate solid (Ammonium carbamate, referred to as ammonium carbamate) at a temperature lower than about 59°C under normal pressure, which can easily cause equipment and / or pipeline blockage. However, since the boiling point of ammonia (-33°C under normal pressure) and carbon dioxide (-78°C under normal p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/62B01D53/96
CPCY02A50/20Y02C20/40
Inventor 王讯文韩晖刘丹
Owner YASHENTECH CORP
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