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

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 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 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.