The invention provides a method for microwave synthesis of a ZSM-5 molecular sieve by means of strengthening of an impinging stream-rotating packed bed and belongs to the technical field of molecular sieve synthesis. The method for microwave synthesis of the ZSM-5 molecular sieve by means of strengthening of the impinging stream-rotating packed bed can solve the problems that in the prior art, a prepared ZSM-5 molecular sieve is uneven in particle size distribution, the crystallization time is long, and energy consumption and cost are high. A silicon source containing seed crystals and an aluminum source mixed solution are fed into the impinging stream-rotating packed bed at the same time to be blended, microwave heating is conducted on reaction liquid for crystallization, a crystallized product is repeatedly washed with deionized water until the pH value is 7-9, and after drying and calcination, the ZSM-5 uniform in particle size distribution is obtained. The method for microwave synthesis of the ZSM-5 molecular sieve by means of strengthening of the impinging stream-rotating packed bed is simple, low in preparation cost and short in crystallization time.

Method for microwave synthesis of ZSM-5 molecular sieve by means of strengthening of impinging stream-rotating packed bed

The invention discloses a preparation method for a cobalt-doped zinc oxide gas-sensitive material and application thereof, which relate to the technical fields of material chemistry and gas-sensitivesensors. Polyvinylpyrrolidone (PVP), zinc acetate and cobalt nitrate hexahydrate are dissolved in 75ml of ethylene glycol, wherein polyvinylpyrrolidone, the molecular weight of which is 400,000, is 0.3g, the molar ratio of cobalt nitrate hexahydrate to zinc acetate is between 0.025 and 0.233, and thereby the cobalt-doped nanoscale spherical zinc oxide gas-sensitive material is prepared. Because amicrowave-and-ultrasonic wave-co-assisted solvothermal method is adopted in the process of preparation, the cobalt-doped nanoscale spherical zinc oxide material has high detection sensitivity and goodselectivity; and the preparation method is simple and harmless to the environment, and effectively overcomes defects existing in the prior art, for example, preparation methods are complex and cost is higher and production process conditions are strict, and sensors have high working temperature, low response and recovery speed and short service lives.

Preparation method for cobalt-doped zinc oxide gas-sensitive material and application thereof

The invention discloses a methanol gasoline corrosion inhibitor. The methanol gasoline corrosion inhibitor comprises the following components by mass: 18 to 25% of methanol, 10 to 20% of sodium hydroxide, 10 to 20% of benzotriazol, 5 to 12% of polyethylenediamine, 25 to 35% of n-butanol and 2 to 10% of polyvinylpyrrolidone. The above-mentioned components are uniformly mixed under full stirring so as to obtain the methanol gasoline corrosion inhibitor. Compared with the prior art, the invention has the following advantages: the methanol gasoline corrosion inhibitor has good corrosion inhibition effects on copper, iron and aluminum, is capable of adjusting the content of organic acid in methanol, forms a protection film on metal surface and can effectively alleviate rubber swelling caused by methanol; and through addition of 1% of the methanol gasoline corrosion inhibitor into methanol gasoline, methanol has corrosivity lower than first-grade copper corrosion and has a pH value of 7.4, completely meeting standards of national standard gasoline in China.

Methanol gasoline corrosion inhibitor

The invention provides a methanol gasoline additive. The methanol gasoline additive is prepared from, by weight, 12-15 parts of n-butyl alcohol, 8-10 parts of dimethyl carbonate, 2.5-3 parts of coconut diethanolamide, 1.5-2 parts of hexaethylene glycol monodecyl ether, 8-10 parts of 2-acetoxy-1-methoxypropane, 12-15 parts of 2-methyl-2-propanol, 1.5-2 parts of polyoxyethylene castor oil, 2-2.5 parts of propargyl alcohol, and 1-1.5 parts of tert-butylhydroquinone. The methanol gasoline additive is prepared through a special formula and a special technology. The cosolvent, dispersing agent, corrosion inhibitor and gas resistance improver in the methanol gasoline additive come into play, and synergistic effects among the components are prominent; gas resistance of methanol gasoline can be obviously reduced, and corrosion to metal and swelling to rubber of the methanol gasoline can be reduced.

Methanol gasoline additive and preparing method thereof

The invention discloses methanol composite gasoline which is prepared from the following components in percentage by weight: 35%-55% of methanol, 5%-10% of ether, 3%-15% of aromatic hydrocarbon, 5%-8% of a surfactant and 20%-50% of solvent oil, wherein ether is ethylene glycol butyl ether, methyl tertiary butyl ether or diisopropyl ether; the surfactant is an emulsifier MOA-3, an emulsifier MOA-9, an emulsifier MOA-3B or an emulsifier OS-15; aromatic hydrocarbon is a mixture of methylbenzene and dimethylbenzene. A preparation method of the methanol composite gasoline comprises the step of fully dispersing and mixing the components in a static mixer to obtain the methanol composite gasoline. The methanol composite gasoline can be stored for more than one year and is good in water resistance.

Methanol composite gasoline and preparation method thereof

The invention relates to a high stability methanol gasoline and a preparation method thereof. The high stability methanol gasoline is prepared by mixing 40% to 80% of motor gasoline, 10% to 50% of industrial methanol, 7% to 15% of phase stabilizers, and 0% to 5% of steam pressure regulators or 0.05% to 1% of anti-corrosion and anti-swelling agents according to volume percentage. The method includes that in normal pressure and temperature, the industrial methanol is added in a tempering tank containing the motor gasoline in proportion, the phase stabilizers, the steam pressure regulators and the anti-corrosion and anti-swelling agents are sequentially added in the tank in proportion, materials in the tank are cycled by pumping and stirred for 10 to 20 minutes, still standing is performed in the tempering tank for 1 to 2 hours, and the materials in the tempering tank are filled in a storage tank for reserve. The prepared methanol gasoline has the advantages that the stability is high, the motive power is high, the fuel consumption is low, the methanol gasoline is efficient and clean, the preparation cost is low, and the methanol gasoline can be directly used by motor vehicle engines and has an excellent industrial production prospect.

High stability methanol gasoline and preparation method thereof

The invention discloses a preparation method of a narrow-distribution small-crystal ZSM-5 molecular sieve, belongs to the field of material preparation, and aims to provide a ZSM-molecular sieve, which has the advantages of small crystal, short reaction time, high yield, and narrow distribution of crystal size. The preparation method comprises the following steps: mixing a template, deionized water and an aluminum source according to a certain ratio, then adding a silicon source, placing the obtained mixed solution in a water bath, carrying out reactions for 0.5 to 2 hours under supersonic waves, then carrying out reactions for 0.5 to 2 hours under microwaves, subjecting the reaction product to hydrothermal crystallization, and washing, drying, and burning the obtained product so as to obtain the narrow-distribution small-crystal ZSM-5 molecular sieve. The prepared narrow-distribution small-crystal ZSM-5 molecular sieve has the advantages that the distribution range of crystal size is very narrow, the molecular sieve is uniform, no foreign crystal exists, the structure is regular, and the crystallization degree is high. Moreover, during the whole preparation process, the operation is simple, no additive is added, the synthesis time is short, and the preparation method can be easily applied to industrial production.

Preparation method of narrow-distribution small-crystal ZSM-5 molecular sieve

The invention relates to a dehydrating agent for medium-and-low-temperature coal tar and an application of the dehydrating agent. The dehydrating agent comprises the following components in parts by mass: 0.5-1 part of alkyl phenolic resin polyoxyethylene ether, 1.5-4 parts of phenol amine aldehyde resin segmented polyoxyethylene polypropylene ether and 2.5-5 parts of methanol, which are compounded, wherein the molecular weight of each polyether is 5000-8000. When in use, 0.5-1 kg of the dehydrating agent needs to be added into each ton of the medium-and-low-temperature coal tar, so that the water content of the coal tar is reduced to be within 4% and meets the water content requirement of the finished coal tar. The dehydrating agent has the advantages of high dehydrating speed, low required temperature, small dosage and low cost; the enterprise cost can be reduced.

Dehydrating agent for medium-and-low-temperature coal tar and application of dehydrating agent

The invention relates to a methanol-to-olefin product two-dimensional gas chromatography online detection device and method. The methanol-to-olefin product two-dimensional gas chromatography online detection device comprises a first pressure stabilizing module, a multi-way pass valve, a first chromatographic column and a gas circuit switching mechanism which are sequentially connected through a pipeline, wherein the multi-way pass valve is also connected with a quantitative loop; the gas circuit switching mechanism is also connected with an organic oxygen-containing material detector; a firstpipeline and a second pipeline are respectively connected to the rear of the gas circuit switching mechanism; detectors are arranged on the first pipeline and the second pipeline; the first detector is arranged on the first pipeline; the second detector is arranged on the second pipeline; a second chromatographic column is also arranged on a pipeline, located in front of the first detector, of thefirst pipeline; the first chromatographic column is a Lowox capillary column; the second chromatographic column is a PLOT Q or PLOT Al2O3 chromatographic column. The device and the method provided bythe invention prevent an oxygen-containing organic matter from damaging an Al2O3 filler in the chromatographic column.

Methanol-to-olefin product two-dimensional gas chromatography online detection device and method

The invention belongs to the technical field of catalysts, and particularly relates to a binder-free spray forming technology for improving the molecular sieve catalyst strength. The technology comprises the following steps that 1, dispersant is added in deionized water to form a dispersant solution, a molecular sieve catalyst is added in the dispersant solution, and slurry with the solid contentbeing 35-50% is formed; 2, an agate ball is added in the slurry, ball milling is conducted for 2-6 h, sieving is conducted, the agate ball is separated, and the separated slurry is preserved at the constant temperature of 25 DEG C; 3, the slurry obtained in step 2 is subjected to spray drying forming; 4, a product obtained in step 3 is dried in an air atmosphere of 100-150 DEG C, and then roastingis conducted. According to the forming technology, the abrasive resistance of the catalyst is improved, and on the condition that a binder is not added, the high abrasive resistance can still be kept.

Zhang Ju

Papers

High stability methanol gasoline and preparation method thereof

Preparation method of narrow-distribution small-crystal ZSM-5 molecular sieve

Dehydrating agent for medium-and-low-temperature coal tar and application of dehydrating agent

Methanol-to-olefin product two-dimensional gas chromatography online detection device and method

Binder-free spray forming technology for improving molecular sieve catalyst strength