Condensation crystallization device and method

A technology of crystallization equipment and crystal nucleus, which is applied in the field of chemical equipment, can solve the problems of small crystal particle size, easy blockage of pipelines, easy wall formation, and agglomeration, so as to avoid crystallization and scaling, ensure stable and continuous operation, and ensure stable and continuous operation. simple effect

Pending Publication Date: 2019-03-29
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD +1
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome defects such as small crystal particle size, easy wall formation, agglomeration, and easy blockage of pipelines in the prior art, so as to provide a method that can obtain large crystal particles and prevent wall formation. , agglomeration and pipeline blockage desublimation crystallization equipment and crystallization method

Method used

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  • Condensation crystallization device and method
  • Condensation crystallization device and method

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Embodiment 1

[0043] This embodiment provides a crystal desublimation equipment, such as figure 1 As shown, it includes: a cylinder 4, and the cylinder 4 is divided into:

[0044] The crystal nucleus forming section 1 is provided with a process gas inlet 11 on the top and a first heat preservation structure 12 on the outside;

[0045] The crystal growth section 2 is provided with several cold air intake pipes 21, and a second heat preservation structure 22 is provided outside;

[0046] The discharge section 3 is provided with a solid discharge port 31 and a rotating part 32 at the bottom, the rotating part 32 drives the crystallized solid material to the solid discharge port 31 for discharge, and the discharge section 3 is provided with a gas discharge port 35 , a third thermal insulation structure 33 is arranged on the outside. In this embodiment, the gas outlet is a discharge pipe extending into the center of the discharge section 3 .

[0047] The above-mentioned crystallization desubl...

Embodiment 2

[0054] This embodiment provides a method for sublimation crystallization, such as figure 2 As shown, the practical application in the production of melamine is taken as an example to illustrate, including the following steps:

[0055] Crystal nucleation stage: high temperature gas containing melamine material (the main components are melamine, ammonia and CO 2 ) from the process gas inlet 11 at the top of the desublimation crystallization equipment cylinder body 4 to the crystal nucleus formation section 1, and a small amount of cold air from the crystal growth section 2 (the main components are ammonia and CO 2 ) for mixing. The pressure inside the sublimation crystallizer is 0.3MPa, and the melting point temperature of melamine under this pressure is 300°C. Gu controls the temperature in this section to be 270-300°C. At this time, the gas phase material begins to crystallize and form a small amount of crystal nuclei; the temperature in this section cannot Too low to avoid...

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Abstract

The invention belongs to the technical field of chemical equipment, and particularly relates to a condensation crystallization device and method which can obtain large crystalline particles. The condensation crystallization device comprises a crystal nucleus forming section, a crystal growth section and a discharging section. By arranging a heat-preservation structure outside a cylinder, the temperatures and temperature drop amplitudes of all the sections in the cylinder can be controlled, then crystal nucleus formation and crystal growth are controlled, and thus crystallized materials with the ideal particle size are obtained; meanwhile, the heat-preservation structure can further conduct heat preservation on the inner wall of the cylinder, thus the inner wall of the cylinder is preventedfrom being crystallized and scaled, and the crystallized materials are further prevented from collapsing and then blocking a discharging outlet; and a rotating part is arranged at the bottom of the discharging section, through rotating of the rotating part, the crystallized materials are scraped down from the cylinder wall and driven to the discharging outlet to be discharged, thus the situationof blocking of the discharging outlet is avoided, and stable and continuous operation of the device is guaranteed. The device is simple in structure, a complex anti-scaling structure does not need tobe arranged, and regular shut-down for descaling and maintenance is not needed.

Description

technical field [0001] The invention belongs to the technical field of chemical equipment, and in particular relates to a sublimation crystallization equipment and a crystallization method capable of obtaining large crystal particles. Background technique [0002] Desublimation refers to the phenomenon that a substance changes directly from a gaseous state to a solid state, also known as desublimation crystallization, which is a physical state change that occurs when the temperature and pressure are lower than the triple point. For example, snow is produced by the condensation of water vapor. . Sublimation crystals are widely used in the petrochemical industry. [0003] For example, in the traditional melamine production process, the melamine produced exists in the hot process gas in gaseous form at 350°C. It is necessary to mix the cold gas with the hot process gas. For gas-solid separation. However, different desublimation separation technologies will lead to great diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D7/02
CPCB01D7/02
Inventor 唐印孔德利曹学刚莫玉馨宋国天
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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