56results about How to "Inhibition of isomerization" patented technology

The invention provides an isoborneol production method which is carried out in a reinforced radial flow reaction system (IRR) composed of a liquid flow reinforced immersed fixed bed reactor. The isoborneol production method comprises the following steps: mixing the raw materials and a composite solvent by adopting a certain quantity of composite solid acid catalyst according to a certain ratio, wherein camphene and water are used as the raw materials; carrying out hydration reaction in an IRR reaction-separation system to obtain an isoborneol product. The reaction temperature is 40-90 DEG C, the mass of the catalyst is 15-50% of the total mass of the firstly-filled liquid material, the ratio of the camphene to the water to the composite solvent is 1:(0.15-2):(0.5-4), the reaction pressure is 0.1-0.3MPa, and the reaction standing time is 40-70min. After the reacted materials are separated and subjected to ion exchange, the solvent and the unreacted materials are returned to the reactor, and the product is stored. The isoborneol production method has the advantages that the industrial reliability is good, the per-pass conversion rate of the camphene is high, the isoborneol is good in selectivity, and the energy consumption per unit product is only about 60% of that of the traditional fixed bed process.

The invention provides a method for preparing a low-foaming cleaning agent, wherein the formula of the low-foaming cleaning agent is: anhydrous sodium metasilicate 1.6%-2.0%, polytricarboxylic acid ester 2%-4%, carboxylic acid amine Corrosion inhibitor 1%-3%, benzotriazole 1%-3%, polyacrylic acid 1%-3%, polyether modified silicone type defoamer 5%-8%, foam inhibitor 2%- 4%, water balance; wherein the preparation method of polyether modified silicone type defoamer is: prepare hydrogen-containing silicone oil; prepare mixed solution A; synthesis reaction; obtain viscous solid B which is polyether modified silicone Type defoamer. The object of the present invention is to provide a preparation method of a low-foam cleaning agent with low foam height and good cleaning effect.

The invention provides a modified catalyst. Aluminum silicate is subjected to ion exchange in ammonium salt solution to obtain an ion exchange product, the ion exchange product and adhesive mixture is formed in acid liquor to obtain a formed product, and the formed product is baked to obtain the modified catalyst. The modified catalyst prepared by the preparation method is high in acidity, isomerization of C9 aromatics can be inhibited when the modified catalyst is used for catalyzing methylbenzene and the C9 aromatics to perform transalkylation reaction to prepare xylene, and finally, the modified catalyst has high selectivity for the xylene. Results indicate that the highest selectivity of the modified catalyst for the xylene can reach 68.61%.