摘要:
Disclosed is a process for converting naphtha. Lower olefin, light aromatic hydrocarbon, and gasoline with high octane number are produced through combining catalytic cracking of naphta with steam cracking of lower alkane and catalytic cracking of higher alkane and higher olefin. The process increases the yield of product with high value an decreases the yield of product with low value significantly. At the same time, the power consumption is decreased as whole since most reactants are converted in catalytic cracking at lower temperature
摘要:
A surfactant-Improved simultaneous saccharification and co-fermentation method for lignocelluloses is provided, which relates to the field of the production of fuel ethanol by the fermentation process of biomass feedstock degradation, and the technical solution of the present invention is that the pretreated lignocellulose substrate is directly subjected to surfactant-Improved simultaneous saccharification and co-fermentation without any detoxification by adding a surfactant, wherein the surfactant may be selectively added before or after the pre-enzymatic hydrolysis, wherein the present invention has economic, effective and feasible application prospects in reducing the loss of glucose, simplifying the production process, reducing equipment investment, reducing water consumption and improving ethanol production and so on, and in addition for the first time, the present invention ferments fast-growing poplar without detoxification by adding a surfactant and the simultaneous saccharification and co-fermentation method to produce ethanol, and the concentration and yield of ethanol has been improved and the total cost of the ethanol production process from lignocellulosic to ethanol is effectively reduced.
摘要:
This application relates to a method for preparing methyl formate. A raw material containing formaldehyde, methanol and/or dimethyl ether is introduced into a first reaction zone to come into contact with a catalyst A, and a component I is obtained by separation. The component I is introduced into a second reaction zone to come into contact with a catalyst B so as to obtain, by separation, methyl formate as a product, dimethyl ether that is returned to the first reaction zone and a component II that is returned to the second reaction zone. The ratio of formaldehyde, methanol and/or dimethyl ether in the raw material is formaldehyde:methanol and/or dimethyl ether = 1:2-4 based on the mole number of carbon atoms contained in respective component; the mass hourly space velocity of formaldehyde in the raw material is 0.01-15.0 h -1 ; the temperature is 50-100°C in the first reaction zone; the temperature is 50-200°C and the pressure is 0.1-10 Mpa in the second reaction zone; and the components are each independently in a gas phase and/or a liquid phase. In the present application, the catalysts have a long service life, the reaction conditions are mild, and the utilization rate of the raw material is high, and thus the invention enables a continuous production and has the potential for large-scale industrial application.
摘要:
This invention relates to a method for preparing p-xylene and co-producing propylene with a high selectivity. Toluene and methanol and/or dimethyl ether as raw materials are brought into contact with a catalyst in a reaction system for reaction, and after the resultant product is separated via a separation system, an ethylene-enriched C 2 - component (hydrocarbons having carbon number less than or equal to 2, CO, CO 2 , and H 2 ) therein is returned to the reaction system for further reaction, a C 6 + component (aromatic hydrocarbons having carbon number greater than or equal to 6) is subjected to further separation to obtain p-xylene, and a C 3 component (propylene and propane having a carbon number equal to 3) is subjected to further separation to obtain propylene. This method prepares p-xylene and co-produces propylene with a high selectivity, by coupling two reaction processes, an alkylation reaction of toluene with methanol and/or dimethyl ether and an alkylation reaction of ethylene with methanol and/or dimethyl ether, recycling an ethylene-enriched C 2 - component in reaction byproducts of alkylation of toluene and methanol and/or dimethyl ether, and performing alkylation reaction with methanol and/or dimethyl ether in the presence of catalysts.
摘要:
The present invention relates to a method for improving the light olefin yield in the process of preparation of a light olefin using an oxygen-containing compound. More specifically, the present invention provides a method for preparing a light olefin using an oxygen-containing compound, in which, a multi-stage dense phase fluidized bed comprising k secondary pre-carbon deposition zones (k≥1) and n secondary reaction zones (n≥1) is used as a reactor, and a multi-stage dense phase fluidized bed regenerator comprising m secondary regeneration zones (m≥2) is used as a main equipment. By the method of re-refining the hydrocarbons with four or more carbons obtained in the separation section, or adding naphtha, gasoline, condensate oil, light diesel oil, hydrogenation tail oil or kerosene in the reaction zone, the invention primarily solves the problems in the prior art of the uniformity of carbon deposition amount and the carbon content of the catalyst being difficult to control, and the light olefin yield being low.
摘要:
Provided is a Beta molecular sieve having multi-level channels and synthesis method thereof The molecular sieve has a two-level mesoporous structure and uses polyquaternium-6, polyquaternium-7, polyquaternium-22, or polyquaternium-39 as a guiding agent for both micropores and mesopores during the process of synthesis. The present invention uses cheap raw materials and a simple synthesis method, and has broad industrial application prospect.
摘要:
A pseudo-esterase activity -based fluorescent probe for specific detection of albumin and its applications. This probe is based on human serum albumin's pseudo-esterase activity, that is to say, under the condition of physiological pH value, the carboxylic ester bond of the probe (λex = 342 nm, λem = 416 nm) could be selectively cleaved by human serum albumin (HSA) to release the 4-hydroxy-1,8-naphthalimide fluorophore, while the dibenzoyl group covalently bound to the amino acid residues of HSA. The fluorescence emission spectrum of the product is significantly different from that of the substrate molecule (λex = 452 nm, λe m = 564 nm), and according to the fluorescence intensity of substrate and product we can detect the content of HSA in the system. This probe can be used for the determination of the absolute content of albumin in biological samples with the advantage of high accuracy, sensitivity, little influence from the environment and it is compatible with a variety of endogenous substances, exogenous drugs, and surfactant and so on.
摘要:
The present invention provides a SAPO-34 molecular sieve, whose chemical composition in the anhydrous state is expressed as: mDGA·(Si x Al y P z )O 2 ; wherein DGA is diglycolamine, distributing in the cages and pores of said molecular sieve; m is the molar number of the template agent diglycolamine per one mole of (Si x Al y P z )O 2 , and m is from 0.03 to 0.25; x, y, z respectively represents the molar number of Si, Al, P, and x is from 0.01 to 0.30, and y is from 0.40 to 0.60, and z is from 0.25 to 0.49, and x + y + z =1. Said SAPO-34 molecular sieve can be used as an acid-catalyzed reaction catalyst, such as a methanol to olefins reaction catalyst. The present invention also concerns the application of said SAPO-34 molecular sieve in adsorption separation of CH 4 and CO 2 .
摘要翻译:本发明提供SAPO-34分子筛,其无水状态的化学组成表示为:mDGA·(Si x Al y P z)O 2; 其中DGA是二甘醇胺,分布在所述分子筛的笼和孔中; m是每摩尔(Si x Al y P z)O 2的模板剂二甘醇胺的摩尔数,m为0.03至0.25; x,y,z分别表示Si,Al,P的摩尔数,x为0.01〜0.30,y为0.40〜0.60,z为0.25〜0.49,x + y + z = 1。 所述SAPO-34分子筛可用作酸催化的反应催化剂,如甲醇 - 烯烃反应催化剂。 本发明还涉及所述SAPO-34分子筛在CH 4和CO 2的吸附分离中的应用。
摘要:
The present invention concerns a SAPO-34 molecular sieve and method for preparing the same, whose chemical composition in the anhydrous state is expressed as: mDIPA·(Si x Al y P z )O 2 , wherein, DIPA is diisopropylamine existing in cages and pore channels of said molecular sieve, wherein m is the molar number of diisopropylamine per one mole of (SixAlyPz)O 2 , and m is from 0.03 to 0.25; x, y, z respectively represents the molar number of Si, Al, P, and x is from 0.01 to 0.30, and y is from 0.40 to 0.60, and z is from 0.25 to 0.49, and x + y + z =1. The SAPO-34 molecular sieve can be used as catalysts for acid-catalyzed reaction or oxygenate to olefins reaction.