32results about How to "Moderate acid strength" patented technology

The invention discloses a preparation method of a styrenated hindered phenol or styrenated phenol antioxidant product, belonging to the field of preparation process methods of polymer antioxidant products. The preparation method is characterized in that: o-tert-butyl phenol or phenol, p-cresol, o-cresol and m-cresol are used as raw materials, styrene is used as an alkylation reagent, an organic acid compound is used as a catalyst, a small amount of polymerization inhibitor is added, and the styrenated hindered phenol product or styrenated phenol product is prepared through catalytic alkylation reaction; a neutralizing and decolorizing agent is added to the styrenated product to deactivate the acidic catalyst and remove the coloring source material, thus obtaining a white-like or light yellow viscous liquid namely the styrenated phenol antioxidant product which has clear and transparent appearance, pH value of 6.5-7.5, storage stability and high use efficiency; and the styrenated phenol antioxidant product is free of water-soluble pollutants such as free phenol or methyl phenol, thereby solving the problem of environmental pollution caused by the use of the product in styrene butadiene rubber latex.

The invention relates to a glycol ether preparation method, mainly solving the problems of the original technique that the target product, glycol ether, has low selectivity, high alcohol/ epoxy ethane ratio (alcohol/ alkyl ratio) and no concern on catalyst stability. The invention uses epoxy ethane and lower fatty alcohol as raw materials, adopts niobium oxide as a main activated component, and chooses at least one of elements or compounds of V, Mo, Sn, Pb, La, Pr, Nd as auxiliary agent to form catalyst, so as to prepare glycol ether under the reaction temperature of 100 to 300 DEG C, reaction pressure of 0.1 to 3.0MPa, alcohol/ alkyl ratio of 1-5: 1, and reaction time of 30 minutes to 8.0 hours. The technical proposal can well solve the problem and can be used for the industrial production of the glycol ether.

The present invention relates to a catalyst for preparing dimethyl ether by using methyl alcohol dehydration. Said catalyst is made up by using niobium oxide as main active component and selecting at least one kind of phosphorus or sulfur as adjuvant through a certain preparation process. Said catalyst not only has good activity, but also possesses good stability.

The invention relates to a preparation method of an isobutyl ketone synthesis catalyst. The catalyst is prepared by loading bimetallic nickel and copper on alkaline-earth metallic oxide/aluminum oxide composite carrier. The preparation method of the catalyst comprises the three steps of: firstly adopting a sol-gel method to prepare the alkaline-earth metallic oxide/aluminum oxide composite carrier; then introducing active metal nickel and copper by an immersion method; and finally carrying out water hydrothermal treatment to prepare the catalyst. The preparation method has the advantages of simplicity, high activity and selectivity, integration of three catalysis functions such as condensation, dehydration and hydrogenation of acetone, and simple reaction process flow.

The invention belongs to the field of molecular sieves, particularly relates to a low-silicon AEI/CHA eutectic nano molecular sieve, a preparation method and applications thereof. A purpose of the invention is mainly to solve the problems of low AEI content, complex preparation process, high template agent price, high template agent dosage, high production cost and the like in the AEI/CHA eutecticmolecular sieve prepared by the conventional synthesis method. The preparation method of the molecular sieve specifically comprises the following steps: adding an aluminum source, a phosphorus source, a template agent and the like into distilled water, uniformly stirring and dispersing, and then adding a seed crystal to obtain a mixed solution; and crystallizing, separating, washing, drying and roasting the obtained mixed solution to obtain the eutectic nano molecular sieve formed by AEI and CHA symbiosis. The molecular sieve obtained in the invention has the advantages of high proportion ofAEI structural units and uniform dispersion of silicon species, and further has high CO conversion rate and low carbon olefin selectivity in a reaction for preparing low carbon olefins through directconversion of catalytic synthesis gas.

The invention relates to a method for producing isopropylbenzene through transalkylation. Transalkylation catalyst is obtained by mixing Hbeta/HMCM-49 composite molecular sieve powder, assistant, binding agent, pore-forming agent and lubricant evenly in proportion. The transalkylation catalyst is grinded, granulated, squeezed in strip mode, dried, roasted and cooled to obtain the assistant styrene (SB) powder or one of the SB powder, phosphoric acid, ammonium phosphate and boric acid. The binding agent is sesbania powder, the pore-forming agent is one of methylcellulose, citric acid and oxalic acid, the lubricant is one or two of nitric acid with the concentration of 0.5-15% and phosphoric acid with the concentration of 0.5-15%, and a raw material is diisopropylbenzene or/and triisopropylbenzene and benzene. The transalkylation catalyst is good in activity, high in selectivity and long in service life, and yield of the isopropylbenzene can reach 72.1%-94.1%.

The invention relates to a high-fluorine-containing C9 resin hydrogenation catalyst, which is composed of an active component M1, an auxiliary agent component M2 and a carrier component M3. Based on 100% of the total weight of the catalyst, the content of the M1 component is 37%-54%, the content of the M2 component is 4%-6%, and the balance is the M3 component. The component M1 contains Ni, Mo, Cu and Al, the component M2 contains Sm and Na, and the component M3 is amorphous silicon-aluminum MgAl2O4 composite oxide. The invention also discloses a preparation method and application of the catalyst. The catalyst provided by the invention is used for hydrogenation removal of fluorine and sulfur in C9 resin, and can effectively delay fluorine and sulfur poisoning of a rear-stage hydrogenation catalyst.

The invention relates to the field of petroleum processing, discloses a preparation method of an SBA-15/ZSM-5 composite molecular sieve material and application in double branched chain isomerization, and in particular relates to a low-cost green preparation method of an SBA-15/ZSM-5 composite molecular sieve material with proper acidity and a stepped pore channel structure and a sulfur-tolerant double-branched-chain isomerization catalyst prepared by loading non-noble metals on the SBA-15/ZSM-5 composite molecular sieve material. The catalyst is applied to a catalytic cracking (FCC) gasoline hydroisomerization reaction. According to the invention, a ZSM-5 molecular sieve nanocrystalline precursor solution is greenly synthesized by taking natural minerals as raw materials without a template agent, and then the SBA-15/ZSM-5 composite molecular sieve carrier is prepared through in-situ assembly by adopting a low-acidity prehydrolysis method, so that the production cost is greatly reduced, the equipment corrosion is relieved, and the pollutant emission is reduced. Therefore, the method provided by the invention has good economic and environmental benefits, and provides technical support for promoting the industrialization process.

The invention relates to a method for preparing ethylene glycol by an ethylene one-step method. The method comprises the following steps: preparing ethylene glycol: under an acidic reaction condition, contacting ethylene, hydrogen peroxide and a titanium silicalite molecular sieve in water, and carrying out an oxidation hydration reaction to obtain the ethylene glycol. The acidic reaction condition is provided by a non-zeolite molecular sieve; the non-zeolite molecular sieve includes a homogeneous liquid acid and/or a heterogeneous solid acid. The method is high in effective utilization rate of hydrogen peroxide, and the target product ethylene glycol is high in selectivity and high in concentration.