30results about How to "Avoid deep reaction" patented technology

The present invention provides a fluidized catalytic process for production of dimethyl ether from methanol, wherein said process is carried out in a reactor in which the catalyst is in a fluidized state. Said process comprises the following steps of (1) feeding the methanol feedstock via two or more locations selected from the bottom, lower part, middle part and upper part of the reactor, contacting with the catalyst for preparation of dimethyl ether by methanol dehydration, carrying out the reaction of preparing dimethyl ether by methanol dehydration to obtain the reaction stream, separating said reaction stream to obtain a coked catalyst and a crude product primarily containing the target product, i.e. dimethyl ether; (2) totally or partially feeding the coked catalyst obtained in step (1) into a regenerator in a continuous or batch manner for regeneration via coke-burning, the regenerated catalyst being directly recycled to step (1) after being totally or partially cooled.

The invention discloses an ethylbenzene dealkylation catalyst and a preparation method thereof. In the method, the MOR type molecular sieve loaded with active metal components is embedded in the organic matter, then uniformly mixed with the precursor of the high-temperature resistant inert oxide, shaped, dried and calcined to obtain the ethylbenzene dealkylation catalyst. The catalyst of the invention is particularly suitable for the isomerization process of C8 mixed aromatics containing ethylbenzene. Compared with the existing technology, since the molecular sieve used is greatly reduced, not only the production cost of the catalyst is greatly reduced, but also the discharge of difficult-to-treat wastewater in the synthesis process of the molecular sieve is avoided, and it has a higher conversion rate of ethylbenzene and ethylbenzene The conversion of benzene to benzene is characterized by selectivity.

The invention discloses a preparation method of an ethylbenzene dealkylation catalyst, which includes the following contents: (1) loading active components on a macroporous pore-forming agent, and then drying to obtain a modified pore-forming agent; (2) adding MWW small-grain molecular sieves, precursors of refractory oxides, modified pore-forming agents, peptizers and water are kneaded, dried and calcined to obtain catalyst products. The preparation process of the method is simple and the cost is low, and the catalyst product is used in the isomerization process of C8 mixed aromatic hydrocarbons containing ethylbenzene, and has the characteristics of high conversion rate of ethylbenzene and selectivity of converting ethylbenzene into benzene.

The invention discloses a preparation method for a C8 aromatic hydrocarbon isomerization catalyst, which includes the following steps: 1) supporting an active component onto a macro-pore forming agent, and drying the macro-pore forming agent to prepare a modified pore forming agent; 2) performing mix-kneading moulding to an EUO-type small-crystal-grain molecular sieve, a precursor of a melting-resistant oxide, the modified pore forming agent, a peptizer and water, and drying and roasting the mixture to prepare the catalyst. The preparation method is simple in processes and low in cost. The catalyst, when being used in isomerization of C8 mixed aromatic hydrocarbon containing ethylbenzene, has high ethylbenzene conversion rate and low aromatic hydrocarbon loss rate.

The invention discloses a catalyst for selective alkylation of toluene and ethylene and a preparation method thereof. The method is to embed the MWW type molecular sieve with small grains in the organic matter, then mix it evenly with the precursor of the high-temperature resistant inert oxide, form, dry and roast to obtain the selective alkylation catalyst of toluene and ethylene. The catalyst of the present invention is particularly suitable for the selective alkylation of toluene and ethylene to synthesize p-methylethylbenzene. Compared with the existing technology, since the amount of molecular sieve in the catalyst is greatly reduced, not only the production cost of the catalyst is greatly reduced, but also the discharge of difficult-to-treat wastewater in the synthesis process of the molecular sieve is avoided, and it has high catalytic activity and p-methylethylbenzene selectivity. Sexual characteristics.

The invention discloses a method for producing substituted benzyl alcohol, substituted benzaldehyde and substituted benzyl acid through oxidizing substituted methylbenzene with air on the basis of a gas-liquid-solid heterogeneous reaction separation synchronization reactor, wherein the water-containing substituted methylbenzene is added into the reactor, the reactor comprises a reaction tower and at least two constant temperature settlement towers communicated with the bottom of the reaction tower, and the reaction tower is internally provided with a gas phase area, an oxidization area and a gas outlet; the oxidization area and the constant temperature settlement towers are filled with the substituted methylbenzene in the reaction, the air is introduced continuously from the bottom of the oxidization area and is in contact with the substituted methylbenzene to carry out the oxidization reaction, meanwhile, a mixed phase of the produced substituted benzyl alcohol, substituted benzaldehyde and substituted benzyl acid settles and enters the bottom of the constant temperature settlement tower, the substituted methylbenzene in the constant temperature settlement tower is pushed into the oxidization area to lead to the continuous reaction, the reaction tower is switched to be communicated with the other constant temperature settlement tower filled with the substituted methylbenzene when the constant temperature settlement tower is fully filled with the mixed phase, the operation is conducted on the constant temperature settlement towers alternatively to continuously produce the substituted benzyl alcohol, substituted benzaldehyde and substituted benzyl acid. The method is used to continuously produce the substituted benzyl alcohol, substituted benzaldehyde and substituted benzyl acid with high percent of conversion and high selectivity, the production efficiency is improved, and the production cost is lowered.

The invention discloses a preparation method of a paraffin hydrocarbon shape-selective isomerization catalyst, which is characterized in that it includes the following content: (1) loading active components on a macropore pore-forming agent, and then drying to obtain a modified pore-forming agent ; (2) The catalyst product is obtained by kneading TON-type small-grain molecular sieves, refractory oxides, modified pore-forming agents, peptizers and water, and drying and roasting. The preparation process of the method is simple, the cost is low, and the catalyst product is used in the paraffin hydrocarbon type-selective isomerization reaction, and has the characteristics of high yield of the target product and low pour point.

The invention discloses a method for producing a terephthalic acid through the oxidation of p-xylene by using air based on a gas-liquid-solid heterogeneous reaction separation synchronizing reactor, which comprises the following steps that: p-xylene is added into the gas-liquid-solid heterogeneous reaction separation synchronizing reactor, wherein the reactor comprises a reaction tower and at least two constant-temperature subsidence towers communicated with the bottom of the reaction tower, a gaseous phase area, an oxidation area and a gas outlet are arranged in the reaction tower; in the process of reaction, the oxidation area and the constant-temperature subsidence tower are filled with p-xylene, air is continuously fed from bottom of the oxidation area so as to contact and react with the p-xylene, and generated terephthalic acid solids enter the constant-temperature subsidence tower by settling, and meanwhile, the p-xylene in the constant-temperature subsidence tower enters the oxidation area through an outer circulatory system, so that the reaction is running continuously, the p-xylene continues to be settled in the constant-temperature subsidence tower until the constant-temperature subsidence tower is filled, then the reaction tower is switched to be communicated with the other constant-temperature subsidence tower filled with p-xylene, in such an alternate way, continuous production is achieved. According to the method, a terephthalic acid can be continuously produced at high conversion rate and high yield, so that the production efficiency is improved, and the production cost is reduced.

The invention discloses a heterogeneous dewaxing catalyst and a preparation method thereof. The method is to embed the TON type molecular sieve loaded with hydrogenation active components in the organic matter, then mix evenly with the precursor of the high temperature resistant inert oxide, form, dry and roast to obtain the isomerization dewaxing catalyst. The catalyst of the present invention is particularly suitable for use in the isomerization dewaxing process of lubricating oil fractions. Compared with the existing technology, since the amount of molecular sieve in the catalyst is greatly reduced, not only the production cost of the catalyst is greatly reduced, but also the discharge of difficult-to-treat wastewater in the synthesis process of the molecular sieve is avoided, and it has the advantages of high yield of the target product and low pour point features.

The invention discloses an isomerization dewaxing catalyst, and a preparation method thereof. According to the preparation method, MTT-type molecular sieve loaded with a hydrogenation active ingredient is coated with an organic matter, an obtained product is uniformly mixed with a precursor of a high temperature resistant indifferent oxide, and an obtained mixture is subjected to moulding, drying, and roasting so as to obtain the isomerization dewaxing catalyst. The isomerization dewaxing catalyst is especially suitable for isomerization dewaxing of lubricating oil cut fractions. Compared with the prior art, the isomerization dewaxing catalyst possesses following advantages: molecular sieve using amount of the isomerization dewaxing catalyst is reduced greatly, so that catalyst production cost is reduced greatly, and discharge of wastewater difficult to process in molecular sieve synthesis process is avoided; target product yield is high; and pour point is low.

The invention discloses a preparation method of a low-carbon alkane isomerization catalyst, which includes the following contents: (1) loading active components on a macroporous pore-forming agent, and then drying to obtain a modified pore-forming agent; (2) The catalyst product is obtained by kneading and kneading FER-type small-grain molecular sieves, precursors of refractory oxides, modified pore-forming agents, peptizers and water, and drying and roasting. The preparation process of this method is simple, with low cost, and the catalyst product is used for C 5 ~C 10 During the isomerization reaction of alkanes, it has the characteristics of high catalytic activity and high selectivity of isomeric olefins.

The invention discloses a method for producing KA oil through oxidizing cyclohexane by using air on the basis of a gas-liquid-solid heterogeneous reaction separation synchronization reactor, wherein the water-containing cyclohexane is added into the reactor, the reactor comprises a reaction tower and at least two constant temperature settlement towers communicated with the bottom of the reaction tower, and the reaction tower is internally provided with a gas phase area, an oxidization area and a gas outlet; the oxidization area and the constant temperature settlement towers are filled with the cyclohexane in the reaction, the air is introduced continuously from the bottom of the oxidization area and is in contact with the cyclohexane to carry out the oxidization reaction, meanwhile, the produced KA oil is blended with water to form a KA oil phase, the KA oil phase is settled into the constant temperature settlement tower, the cyclohexane in the constant temperature settlement tower at the moment enters the oxidization area through an external circulation system, so that the reaction is conducted continuously, the KA oil phase continues to settle in the constant temperature settlement tower until the constant temperature settlement tower is fully filled the KA oil phase, then the reaction tower is switched to be communicated with the other constant temperature settlement tower filled with the cyclohexane, the operation is conducted on the constant temperature settlement towers alternatively to continuously produce the KA oil. The method is used to continuously produce the KA oil with high percent of conversion and high selectivity, the production efficiency is improved, and the production cost is lowered.

The invention discloses a method for producing adipic acid by oxidizing cyclohexane by utilizing air based on a gas-liquid-solid multiphase reaction and separation synchronization reactor. The method is characterized by adding cyclohexane to the gas-liquid-solid multiphase reaction and separation synchronization reactor, wherein the reactor comprises a reaction tower and at least two constant temperature settling towers communicated with the bottom of the reaction tower, and the reaction tower is internally provided with a gas phase zone, an oxidation zone and a gas outlet; during reaction, filling the oxidation zone and constant temperature settling towers with cyclohexane, continuously pumping air from the bottom of the oxidation zone to come into contact with cyclohexane to carry out oxidation reaction, simultaneously enabling generated adipic acid solid to enter the constant temperature settling towers through settling, at the moment, enabling cyclohexane in the constant temperature settling towers to enter the oxidation zone via an external circulation system so that reaction is continuously carried out, enabling adipic acid to continuously settle in the constant temperature settling towers until the constant temperature settling towers are filled with the adipic acid phase, and switching a reaction tower to be communicated with the other constant temperature settling tower filled with cyclohexane, thus alternating the steps to carry out continuous production. The method can be used for continuously producing adipic acid with high conversion rate and high yield, and has the effects of improving the production efficiency and reducing the production cost.

The invention discloses a preparation method of a paraffin hydrocarbon type-selective isomerization catalyst, which includes the following contents: (1) loading active components on a macropore pore-forming agent, and then drying to obtain a modified pore-forming agent; (2) ) MTT-type small-grain molecular sieves, precursors of refractory oxides, modified pore-forming agents, peptizers and water are kneaded, dried and roasted to obtain catalyst products. The preparation process of the method is simple, the cost is low, and the catalyst product is used in the paraffin hydrocarbon type-selective isomerization reaction, and has the characteristics of high yield of the target product and low pour point.