Multistage molecular sieve dehydration tank for chemical production and dehydration method

Abstract

The invention discloses a multistage molecular sieve dehydration tank for chemical production and a dehydration method. The multistage molecular sieve dehydration tank comprises a tank body; a discharge port is formed in the bottom of the tank body; a throwing cylinder is movably arranged in the tank body; throwing holes are formed in the throwing cylinder; first-stage dehydration molecular sievesare arranged in the throwing cylinder; the first-stage dehydration molecular sieves are dispersedly arranged in the throwing cylinder, the volume of the first-stage dehydration molecular sieves is smaller than volume of an inner cavity of the throwing cylinder; and the bottom of the throwing cylinder is fixedly mounted on a turntable; the turntable is connected with a motor output shaft through arotating shaft via a reducer; a conveying pipe extending into the inner cavity of the throwing cylinder is mounted at the top of the tank body; a plurality of raw material distributors are arranged on the conveying pipe; a dehydration screen drum is sleeved outside the throwing cylinder; screen holes for communicating an inner cavity of the dehydration screen drum with the outside are formed in the dehydration screen drum; a secondary dehydration cavity is formed between the dehydration screen drum and the throwing cylinder; secondary dehydration molecular sieves are contained in the secondary dehydration cavity; and the secondary dehydration molecular sieves are dispersedly arranged, and the volume of the secondary dehydration molecular sieves is smaller than volume of the secondary dehydration cavity. According to the invention, a liquid phase can be uniformly distributed, the liquid phase and a molecular sieve can move, and the dehydration efficiency and dehydration effect can be improved.

Description

technical field [0001] The invention relates to a dehydration tank, in particular to a multi-stage molecular sieve dehydration tank for chemical production. Background technique [0002] In the process of chemical production, it is generally necessary to carry out hydrodesulfurization, dehydrogenation, denitrogenation, etc. on chemical raw materials, and finally obtain various products after rectification in a rectification tower. Since the products after rectification still contain a certain amount of water, they cannot reach The index requirements stipulated by the moisture content of the product affect the sales quality of the product. Therefore, after the general product is rectified, it will be dehydrated. [0003] Molecular sieves have many cavities, and the cavities are connected with many micropores with the same diameter. These tiny pores have uniform diameters, which can absorb molecules smaller than the diameter of the pores into the interior of the pores, and ab...

AI Technical Summary

Problems solved by technology

Due to the good adsorption effect of molecular sieves, in order to ensure the dehydration effect, molecular sieve dehydration is also used for products after rectification. Generally, after the rectification process, it is introduced into a dehydration tank for the next process of dehydration treatment, but the existing dehydration tank The structure of the multi-layer tray is generally adopted, and the compacted molecular sieve is filled between two adjacent trays, thus forming a multi-layer molecular sieve bed. After the liquid enters, it generally permeates downward from the upper layer, and water molecules enter preferentially. The molecular sieve pores on the upper surface of the molecular sieve bed can only continue downward after the molecular sieve pores on the upper surface of the molecular sieve bed are filled. In this way, the flow rate of the liquid phase is reduced due to the resistance generated by the pores on the upper surface of the molecular sieve bed after absorbing water. , resulting in slow penetration of the liquid phase downwards, slowed adsorption speed, and low dehydration efficiency

In addition, the existing molecular sieve beds are generally compacted by compact molecular sieves, so standing dehydration not only prolongs the production time, but also reduces the dehydration efficiency

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