Process for decolorizing sulfolane

Abstract

The invention relates to a refining and decoloring method for sulfolane. In the method, a large-pore strong acidic cation exchange resin tank filled with sulfonic polystyrene and a large-pore strong-base anion exchange resin tank filled with ammonium polystyrene are connected in series, the material orderly passes through the cation exchange resin tank and the anion exchange resin tank under the action of pressure, and the decolored finished product is flown out; the feeding pressure is 1.5kg / cm<3>; the feeding temperature is less than or equal to 60 DEG C; the environmental temperature is more than 0 DEG C; the flow rate of the material is 1 ton / h; when a chromatographic peak of polymerization retarder in the decolored product is detected by gas chromatography, cation exchange resin is broken down and needs to regenerate; after the cation resin is broken down, the flown product is heated to 180 DEG C for 1 hour, the light yellow green color appears, and anion exchange resin is broken down and needs to regenerate. The decolored product by the method does not change color when the product is illuminated or heated to 180 DEG C, has good decoloring effect, solves the color-changing problem of the sulfolane product, and improves the quality of the product.

Description

technical field [0001] The invention relates to a sulfolane decolorization method for removing organic substances that cause discoloration in the color reaction of a sulfolane product by using a strong acid ion exchange resin with a large pore size. Background technique [0002] The sulfolane product of Jinzhou Petrochemical Liulu Company changes color after being placed and illuminated, and the color changes from light yellow to dark yellow or even red. This problem is serious year by year and has become a bottleneck problem affecting the sales revenue of the device. After analysis, the reason for the discoloration of sulfolane products is the photo-oxidative discoloration of sulfolane raw materials and organic additives in the products and the combination with Ca. 2+ , Fe 3+ the color reaction. At present, the raw materials used in the production of sulfolane in the Chinese market are similar to the additives in the products, mainly including the polymerization inhibitor...

AI Technical Summary

Problems solved by technology

[0003] Foreign patents have reports that sulfolane removes impurities in it through a series of cation exchange resins and an anion exchange resin tank, but because the impurity components contained in foreign sulfolane are different from those contained in my country's sulfolane, the cation exchange with ordinary filtered water Resins and anion exchange resins are difficult to remove completely

Ordinary resin can only remove simple cations and anions in water medium, it cannot remove organic matter and large metal complexes in sulfolane medium

Experiments have shown that if ordinary resin is used for decolorization, because it is not resistant to corrosion and pollution by organic matter, it will soon turn black and lose its exchange capacity.

Ordinary gel-type ion exchange resins can only exchange in water media, and are not suitable for removing organic substances in organic media.

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