Composite solid acid catalyst and preparation method and uses

Abstract

The invention discloses a composite solid acid catalyst for antioxidant RD preparation. The composite solid acid catalyst is characterized in that D002-type strong acid cation exchange resin is compounded with arylsulfonate substances to prepare the solid acid catalyst; in the presence of the composite solid acid catalyst, aniline reacts with acetone to generate an antioxidant RD monomer with high aniline conversion rate and high chemical yield; and then the antioxidant RD monomer is polymerized, distilled and granulated to prepare the antioxidant RD finished product. The composite solid acidcatalyst has the advantages that the continuous environment-friendly process with simple process, high product chemical yield, high content of dimer of the product antioxidant RD, excellent antioxidant effect of the finished product, no three-waste emission and low production cost is suitable for industrial production.

Description

technical field

[0001] The invention relates to a catalyst, in particular to a solid acid catalyst. Background technique

[0002] Rubber anti-aging agent RD (2,2,4-trimethyl-1,2-dihydroquinoline polymer) is a ketone-amine anti-aging agent, which is light yellow to amber powder or flake, mainly used for rubber anti-aging It is one of the rubber antioxidant products with the largest demand in domestic and foreign markets.

[0003] The anti-aging agent RD is synthesized by condensation and polymerization at a temperature of 130-140°C with aniline and acetone as raw materials and acid as a catalyst. According to the process method, it can be divided into one-step method and two-step method. The two-step method is to condense the monomer first, remove the excess reactant, and then polymerize the monomer under acidic conditions; while the one-step method completes the monomer preparation and polymerization reaction at the same time, and then separates the excess reactant. The t...