A coagulation machine and a process for removing the catalyst in the unsaturated polymer hydrogenation solution by using it

Abstract

The invention discloses a coagulator and a process for removing a catalyst in an unsaturated polymer hydrogenation solution by applying the coagulator. The coagulator comprises a motor A, a cylindrical coagulation groove B, a transverse rod type propelling agitator C, a to-be-treated solution feeding opening D, a coagulant feeding opening E, a discharging opening F and a settling tank G, wherein one end of the transverse rod type propelling agitator C is inserted into the cylindrical coagulation groove B and the other end of the transverse rod type propelling agitator C is connected with the motor A at the outer end of the cylindrical coagulation groove B; the to-be-treated solution feeding opening D and the coagulant feeding opening E are formed in the upper side of the cylindrical coagulation groove B and the discharging opening F is formed in the lower side of the cylindrical coagulation groove B; the discharging opening F is connected with the settling tank G with a top outlet and a bottom outlet. By applying the coagulator, a catalyst for rhodium or ruthenium or a noble metal organic complex of the rhodium or the ruthenium can be removed from the sticky unsaturated polymer hydrogenation solution or a butyronitrile type rubber homogeneous phase hydrogenation solution; the process is simple in flow and the production cost and the environmental pollution can be greatly reduced.

Description

technical field [0001] The invention relates to the fields of equipment manufacturing and catalyst removal, in particular to an agglomerator and a process for removing catalysts in unsaturated polymer hydrogenation solutions using the same. Background technique [0002] Due to the carbon-carbon double bond in the molecular chain of unsaturated polymers, its heat resistance, aging resistance, corrosion resistance and other properties are affected, and its application fields are limited. The carbon-carbon double bond, especially the carbon-carbon double bond containing nitrile group, is selectively hydrogenated, so that it not only maintains the original performance, but also improves the aging resistance of heat resistance, corrosion resistance, H2S, O3 and ultraviolet rays. , so that its overall performance can be improved. The selective hydrogenation method of the carbon-carbon double bond in the unsaturated polymer, the catalyst used is mainly the organic complex catalyst...

AI Technical Summary

Problems solved by technology

The method reported at present mainly contains: 1) methanol coagulation method, USP3,700,637 proposes the aftertreatment method that butadiene-acrylonitrile rubber hydrogenation solution (HNBR) is washed repeatedly with methanol to remove the catalyst, until the methanol washing liquid is colorless , the disadvantage of this method is that the amount of methanol is large, and the operation is cumbersome. When HNBR forms micelles, it is not easy to be dispersed, and the catalyst is difficult to be completely eluted, and the residual in HNBR will have a potential impact on rubber properties.

2) adsorption method, USP4,985,540 discloses a kind of chelating resin with mercapto group, thiourea, primary amine, secondary amine with single functional group to remove the rhodium catalyst in the hydrogenated nitrile rubber, this method can operate continuously , and it is not easy to introduce impurities, but due to the high viscosity of the rubber solution, when the resin is used for continuous processing of the glue, the mass transfer resistance is large, the adsorption is slow, and the dosage is large (resin: glue (dry basis) is 1:3) and the treatment cycle time is long ( 54 hours)

The disadvantage of this method is that the amount of precipitation added is large, the particle size of the precipitate is small, and the viscosity of the glue is large, and it is difficult to filter and separate, and the residual precipitant has secondary pollution to the product; 4) kneading method

USP4,857,635 also discloses a kneader and a method for separating noble metal catalysts in the HNBR glue with an extractant in the device. This method has a low removal rate once and needs repeated kneading and extraction for many times. The operation is complicated and time-consuming Long wait is not enough

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