Method for cleaning resin in simulated moving bed

Abstract

The invention provides a method for cleaning resin in a simulated moving bed. The method comprises the following steps: after a system desorption section runs to a separation tower with relatively high pressure, before a strippant enters the next separation tower, separating the separation tower with relatively high pressure from other separation towers, and draining a feed liquid in the separation tower with relatively high pressure; turning off an exhaust valve and a circulating valve of the separation tower with relatively high pressure, and enabling the strippant to enter from the bottom of the separation tower with relatively high pressure; turning on the exhaust valve of the separation tower with relatively high pressure until a liquid flows outside, and turning off the exhaust valve; and turning on a blow-down valve of the separation tower with relatively high pressure until the discharged liquid is clear and is free of a visible impurity, wherein the transmittance is greater than or equal to 95%, and cleaning completely. The method for cleaning the resin in the simulated moving bed has the beneficial effects that the resin in a tower can be cleaned through the method without labor intensity, material squeezing and system circulation time; the content distribution of internal components before separation is not affected; and the work efficiency is improved.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a method for cleaning resin in a simulated moving bed. Background technique [0002] The simulated moving bed is a commonly used separation equipment in the chemical industry. It is separated and purified through the resin packed in the separation column in the simulated moving bed. However, after the equipment has been used for a period of time, the internal pressure of the simulated moving bed separation column will increase or negative pressure will occur, which will damage the external circulation pump, flow meter and other equipment after the occurrence of this situation, and cause serious flow instability in the system Affect the separation effect, what's more, there will be safety hazards when the pressure in the column reaches the limit. [0003] The current solution to this situation is to move the resin out of the separation column for cleaning. For the cleaning of th...

AI Technical Summary

Problems solved by technology

Finally, the inside of the system must be filled with water before the system can start to operate. During the cycle of the system, a large amount of low-refractive liquid is produced, and the steam consumption is large, and it takes about 16 hours to cycle normally to discharge the material.

[0004] In the whole cleaning process above, a lot of manpower, time and energy are consumed, and the production efficiency is also greatly reduced.

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