41results about How to "Adjustable acidity" patented technology

The invention discloses a method for preparing 2,6-dimethyl naphthalene by alkylation reaction of MgAPO-11 molecular sieve catalytic naphthalene. The method comprises the following steps of: I, activating an MgAPO-11 molecular sieve; and II, mixing naphthalene with an alkylation reagent and a solvent to prepare a feed solution, and carrying out alkylation reaction on the feed solution and the activated MgAPO-11 molecular sieve catalytic naphthalene to obtain the 2,6-dimethyl naphthalene. According to the method for preparing 2,6-dimethyl naphthalene by alkylation reaction of MgAPO-11 molecular sieve catalytic naphthalene, the used MgAPO-11 molecular sieve is synthesized by adopting a conventional electric heating method or a microwave heating method; the alkylation reaction of the MgAPO-11 molecular sieve catalytic naphthalene can be used for overcoming the defects that the homogeneous catalysts including anhydrous AlCl3 and the like are difficult to separate from the product, severe in device corrosion and severe in environment pollution, so that the reaction activity and 2,6-DMN (Dimethylnitrosamine) selectivity are higher, the 2,6- / 2,7-DMN ratio and anti-carbon deposition capacity are higher. Moreover, the reaction products and the catalysts are easy to separate. Besides, the method is simple to operate and convenient for large-scale production.

A hydrocarbon catalytic cracking catalyst is characterized in that in terms of 100wt% of the catalyst, the catalyst comprises 30-80wt% of molecular sieve and 10-65wt% clay; the catalyst comprises 5.0-20.0wt% of P calculated in the form of P2O5, and 0-1.0wt% of La2O3; P in the catalyst is provided by aluminium phosphate sol; and the aluminium phosphate sol adopted by the catalyst comprises 2-10wt% of AI and 5-15wt% of P, wherein the pH of the aluminium phosphate sol is 1.0-2.5, and the aluminium phosphate sol comprises 2-20wt% of P calculated in the form of HNO3. The prepared hydrocarbon catalytic cracking catalyst has great strength and high activity, can be used as an auxiliary to be mixed with a main catalyst, hardly reduces the activity of the main catalyst, can improve product distribution, has excellent selectivity for dry gas and coke, and meanwhile can improve the yield of light oil.

The invention relates to a preparation method of the 2,6-DMN, in particular to a preparation method of the 2,6-DMN by using a SAPO-11 molecular sieve. The preparation method mainly solves the problems that catalysts cannot be provided with high activity and 2,6-DMN selectivity simultaneously, and the catalysts are easy to inactivate. The method includes activating the SAPO-11 molecular sieve synthesized by microwave radiation and heating, mixing naphthalene and alkylation reagents with a solvent according to a molar ratio of 1:(2-4):(6-12), and performing alkylation reaction to obtain the 2,6-DMN at a temperature of 350 DEG C to 450 DEG C, at a pressure of 2 MPa to 5 MPa, at a quality airspeed of 0.5-2h-1 and at a carrier gas flow rate of 20-60 mL / min. According to the preparation method, the synthesized SAPO-11 molecular sieve can shorten the crystallization time greatly, and has high catalytic activity to the alkylation reaction of the naphthalene and high selectivity and good anti-carbon deposition competence to the 2,6-DMN.

The invention discloses a catalyst for continuous production of p-methoxycyclohexanone. The catalyst includes a carrier, a Lewis acid and an active noble metal loaded on the carrier, and the active noble metal is Pd and Pt, calculated by 100%. , the mass percentage of Pd in ​​the catalyst is 0.3-0.7%, the mass percentage of Pt is 0.08-0.3%, the mass percentage of Lewis acid is 0.05-0.2%, and the rest are carriers, and the carrier is A columnar activated carbon carrier; at the same time, the invention also discloses the preparation method of the catalyst and the application of the catalyst in producing p-methoxycyclohexanone. The catalyst has good activity, high selectivity and long service life, can efficiently and continuously prepare p-methoxycyclohexanone, the molar conversion rate of raw materials is greater than 99%, and the selectivity of product p-methoxycyclohexanone is greater than 88.5%.

The invention discloses a device for adjusting the valence states of neptunium and plutonium in a hot chamber. The device comprises an inner cylinder, a clamping sleeve, a sample introduction system, a material discharge system, an online sample analysis system, a seasoning bubbling system, and a liquid level measurement system. systems, temperature measurement systems, pressure measurement systems. The device provided by the invention is suitable for use in radioactive and highly corrosive places, and can directly measure the light absorption value of the sample in the hot chamber, and use the spectral absorption peaks of different substances to judge the ion valence state and other information in the material liquid.

The invention relates to a pressurized fluid extraction system and method for removing metal ions in carbon materials, which belongs to the technical field of new energy materials, and solves the problem that the existing removal method needs to use a large amount of acid-containing cleaning solution and the removal effect is poor when removing various metal ions The problem. The pressurized fluid extraction method of the present application includes: step 1, pre-oxidizing the carbon material raw material and cooling it to room temperature in a nitrogen atmosphere; step 2, mixing the pre-oxidized carbon material raw material with quartz sand to form a solid material, and loading the pressurized fluid In the extraction unit of the extraction system; step 3, heat the extraction unit to the working temperature, inject the eluent into the extraction unit for pressurized extraction operation; step 4, inject deionized water into the extraction unit under the same working conditions, and pass Nitrogen gas is added to remove the liquid, and finally a carbon material with trace metal ions removed is obtained. This application avoids the use of a large amount of acid-containing cleaning solution, reduces the number of repeated cleaning operations, and achieves the removal of various metal ion contents to a very low level.

The invention discloses a bad pepper and a preparation method thereof, which is composed of the following raw materials in parts by weight: 60-80 parts of fresh pepper, 10-30 parts of pesto garlic, 10-20 parts of young ginger, 6-15 parts of table salt, 4.5-6 parts of lactic acid bacteria liquid, 0.5-2 parts of white wine, 0.5-0.9 parts of leek juice, 0.03-0.08 parts of citric acid, 0.01-0.03 parts of potassium sorbate, and 0.01-0.03 parts of sodium benzoate. Compared with the prior art, the invention has the advantages of short fermentation time, low nitrite content, higher Vc content preservation and better crispness, and can effectively increase the number of probiotics in the bad pepper, making the taste better and the like.

The invention belongs to the technical field of chemical catalysis and in particular relates to a sulfuric acid catalysis compound and application thereof to production of alkylation gasoline. The sulfuric acid catalysis compound is prepared by adding an amide material which is used as an additive into concentrated sulfuric acid, wherein the content of the additive in the sulfuric acid catalysis compound is 0.5wt% to 10wt%. According to the sulfuric acid catalysis compound, the amide material is used as the additive, so that the cost is low; a C8 component in an alkylation gasoline product is high in selectivity, so that a small quantity of by-products can be generated; a catalysis system can be recycled, so that the acid consumption is reduced; a reaction system is low in corrosion to equipment.

The invention relates to a technical method for preparing 2-ethyl-2-hexenal by catalyzing self-condensation of n-butyraldehyde with an acidic ionic liquid. The technical method comprises the following steps: adding the n-butyraldehyde and an acidic ionic liquid catalyst into a high-pressure autoclave, wherein the using amount of the acidic ionic liquid catalyst is 1-50 percent of the mass of the n-butyraldehyde; and magnetically stirring at 50-150 DEG C and reacting for 0.5-12h, wherein after self-condensation reaction of the n-butyraldehyde, the 2-ethyl-2-hexenal is obtained and the acidic ionic liquid catalyst is a Bronsted acidic ionic liquid or a Lewis acidic ionic liquid. The Bronsted acidic ionic liquid catalyst and the Lewis acidic ionic liquid catalyst are high in catalytic activity, good in selectivity, mild in reaction conditions and reusable; the conversion rate of the n-butyraldehyde is as high as 94.5%; the highest selectivity of the 2-ethyl-2-hexenal is 99.3%; and the acidic ionic liquid catalyst has higher catalytic performance than the traditional industrial liquid alkali catalyst and has a good prospect for industrial application.

The invention discloses a method for synthesizing a gamma, delta-nonsaturated ketones compound. The method comprises the following steps: under protection of inert gas, nonsaturated alcohol and 2-alkyloxy propylene are taken as the raw materials, Bronsted acid functional ionic liquid is dissolved in a high boiling solvent as a catalyst, a rearrangement reaction is carried out, after the reaction is complete, the materials is subjected to post-treatment to obtain the gamma, delta-nonsaturated ketones compound and a catalyst solution. The used Bronsted acid functional ionic liquid catalyst has a plurality of physical and chemical properties which are similar with the conventional ionic liquid, the acid functional group is introduced, so that the catalyst has the advantages of high acid site density, adjustable acidity, uniform acidity distribution and difficult loss of acidity. An autoclave series mode is used for realizing the continuous synthesis of nonsaturated ketone and continuous recycling of the catalyst.