Efficient mixing tank for pta refining unit

Abstract

The invention relates to an efficient stirring tank for a PTA (pure terephthalic acid) refining unit. The efficient stirring tank comprises a tank body (3) and a mechanical sealing device (6) arranged at the top of the tank body (3), wherein the mechanical sealing device (6) comprises oil seals (10), a bearing, a first sealing ring and a second sealing ring which are sequentially sleeved on a shaft sleeve (8) of a stirring shaft (4) from outside to inside, and the technical key points are as follows: the first sealing ring comprises a first active ring (12) and a first compensation ring (11) which are matched, the second sealing ring comprises a second active ring (13) and a second compensation ring (14) which are matched, and a spacer ring (16) is arranged between the first active ring (12) and the second active ring (13); and the oil seals (10) are respectively arranged between a centering bearing (9) and the outer end face of a housing (7) of the mechanical sealing device (6), and between the centering bearing (9) and the first sealing ring. The mechanical sealing device of the stirring tank has the advantages of ingenious structural design, convenience and quickness in assembly and long service life, and can reduce the production cost of PTA.

Description

technical field [0001] The invention belongs to the field of chemical equipment, in particular to a stirring device for a reaction vessel, more specifically to a high-efficiency stirring tank for a PTA refining unit, which is mainly applicable to the refining of PTA. Background technique [0002] Purified terephthalic acid (PTA) is one of the important bulk organic raw materials and is widely used in various aspects of the national economy such as chemical fibers, light industry, electronics, and construction. At the same time, the application of PTA is relatively concentrated. More than 90% of PTA in the world is used to produce polyethylene terephthalate (abbreviated as polyester, PET). In the domestic market, 75% of PTA is used to produce polyester fiber; 20% is used to produce bottle-grade polyester, which is mainly used in the packaging of various beverages, especially carbonated drinks; 5% is used for film-grade polyester, which is mainly used For packaging materials,...

AI Technical Summary

Problems solved by technology

[0004] In the hydrofining process of the above-mentioned CTA, agitated tanks are generally used, but the existing agitated tanks are insufficiently stirred and the stirring efficiency is low, resulting in poor crystallization effect of the final product and low product quality.

Moreover, the mechanical seal device will leak after a period of use (about three months), which will affect the smooth progress of production

In order to ensure the smooth progress of production, it is necessary to carry out regular maintenance on the mechanical seal device, thus raising the production cost of PTA

Images