113results about How to "Low cracking temperature" patented technology

The invention discloses a liquid-phase CO2 phase change cracking permeability-increasing grid type gas extraction method for a low-permeable coal seam. The method comprises the following steps that (1) a bottom board passage is constructed; (2) crossing drilling construction is carried out in the bottom board passage; (3) liquid CO2 phase change cracking is carried out; (4) gas of coal seams of a coal roadway strip and a recovery area is pre-drained with crossing drill holes; (5) the extraction effect of the coal roadway strip area is detected; (6) coal roadway construction is carried out; (7) hole drilling down the seam is carried out; (8) gas of the coal seam in the recovery area is pre-drained with grid type drill holes; and (9) the extraction effect of the recovery area is detected. The method can improve the quantity of drainage of gas of underground coal mine, achieve the purpose of rapidly eliminating danger of outburst for high-gas low-permeable outburst coal seams, prevent coal and gas outburst accidents and guarantee safety production of the underground coal mine.

The invention provides the usage of using the benzoic acid stannous as catalyst. The invention solves the problem that polymerization rate of current catalyst in lactic acid and glycolic acid is slow. The benzoic acid stannous is the catalyst used for preparing low-molecular polymer lactic acid with lactic acid dewatering; benzoic acid stannous is the catalyst used for preparing lactide with low-molecular polymer lactic acid cracking; benzoic acid stannous is the catalyst used for preparing polylactic acid with lactide polymerizing; benzoic acid stannous is the catalyst used for preparing low-molecular polymer glycolic acid with glycolic acid dewatering; benzoic acid stannous is the catalyst used for preparing glycolide with low-molecular polymer glycolic acid cracking; benzoic acid stannous is the catalyst used for preparing poly-glycollide with glycolide polymerizing. The benzoic acid stannous is the catalyst used for polymerizing glycolide, lactide and epsilon-caprolactone. Using the benzoic acid stannous is low content, high productivity, high product purity, low temperature and good repeatability.

The invention discloses a method for producing needle coke by adopting the technique combining delay coking and kettle-type coking. The method comprises: when treating the conventional coking raw material by using the delay coking technique, introducing FCC slurry oil into a delay coking tower from the upper part inside the tower at the low temperature, and obtaining needle coke raw material by fractionating high temperature oil gas obtained by the reaction; and then, treating the needle coke raw material by using the kettle-type coking technique, and obtaining high quality needle coke. In the method, as the FCC slurry oil is injected into the coking tower at the lower temperature, the decomposition temperature of the conventional coking raw material is lowered, the high temperature decomposition time of the raw material is shortened, the occurrence of secondary reaction is reduced, green coke rate is reduced, the stable operation cycle of a signal tower is prolonged, and light components which have high reaction activity and are not beneficial to producing the needle coke, heavy components with high polymerization activity, and a great deal of impurities such as catalyst powder, heavy metal and the like can be removed. The obtained needle coke has high yield and good quality.

The invention relates to an infrared high shield core-shell structure opacifying agent for SiO2 aerogel and a preparation method of the opacifying agent, and belongs to the field of high temperature heat-insulating materials. The opacifying agent is a TiO2-coated SiC hollow core-shell structure ceramic microsphere, wherein the hollow size theta is 0.8-1.5 mu m, the thickness of a nuclear layer SiC is 0.1-0.2 mu m, and the thickness of a shell layer TiO2 is 0.1-0.3 mu m. The preparation method comprises the following steps: I, sequentially adding butyl titanate, polysilazane and divinyl benzene into fused paraffin, and magnetically stirring to obtain a uniform oil phase; dispersing an emulsifier in deionized water in an ultrasonic condition to obtain a uniform water phase; stirring the water phase and the oil phase at a high speed to uniformly emulsify; installing a condensating device, and carrying out a reaction on the emulsion in an oil bath pan; II, centrifugalizing, cleaning and drying the product obtained in the step I; III, sintering the dried product in an atmosphere furnace; and IV, uniformly mixing the sintered product with the SiO2 aerogel and pressing and forming. The core-shell structure ceramic beads are controllable in size, light in weight and high-temperature resistant, and the core-shell structure opacifying agent can effectively improve the anti-infrared shield performance of the SiO2 aerogel.

A synthetic method of a superhigh temperature resistant zirconium carbide ceramic precursor belongs to preparation methods of ceramic precursors. The synthetic method includes firstly, dissolving 6.44g zirconium oxychloride in 50 mL absolute methanol, stirring the mixture at a room temperature for dissolving, subjecting the mixture to ice bath for cooling, dropwise adding 2.4g-3.47g saligenin, finally dropwise adding 4.24g triethylamine at a dropping speed of 1 droplet per second, and subjecting the mixture to magnetic stirring in the process of the dropping adding; after the dropping adding, removing the ice bath and stirring the mixture at a room temperature for 4 hours; then subjecting the mixture to rotary evaporation for 10 minutes to evaporate solvents, adding 50 mL tetrahydrofuran, stirring the mixture at a room temperature for 2 hours, and performing suction filtration to remove a precipitation of triethylamine hydrochloride; subjecting the mixture to rotary evaporation for 15 minutes to evaporate the solvents of colatuie, adding 100 mL hexyl hydride, stirring the mixture at a room temperature for 12-48 hours, performing filtration to obtain a pale yellow precipitation, and subjecting the pale yellow precipitation to vacuum drying for three hours to obtain the zirconium carbide ceramic precursor. The synthetic method of the superhigh temperature resistant zirconium carbide ceramic precursor has the advantages that the even dispersing of modular zirconium components in precursor reins is achieved, the solidification group saligenin are contained in the ceramic precursor so that crosslinking solidification is facilitated, the synthesis temperature is low, the reaction speed is rapid, and the toxicity of solvents is small.

The invention relates to a preparation method of high-strength anti-contact-damage porous SiC, which comprises the following steps: (1) carbonizing wood at 600-1100 DEG C in an inert gas or hydrogen atmosphere for 1-6 hours; (2) carrying out dipping treatment on the carbonized wood in liquid polycarbosilane in a vacuum environment to obtain a carbon template; (3) curing the carbon template subjected to dipping treatment at 180-250 DEG C for 1-5 hours; and (4) carrying out high-temperature treatment on the cured carbon template in an inert gas or hydrogen atmosphere or in a vacuum environment to obtain the porous SiC ceramic. The method provided by the invention can reserve the porous structure in the wood template, so that the porous SiC can still have high compression strength under the condition of high porosity and also have excellent anti-contact-damage capacity.

The invention discloses a method for preparing biologic oil from blue algae in a catalytic cracking mode in vacuum. The biologic oil is prepared by taking blue alga powder as a raw material and a composite metal oxide which takes hydrotalcite as a precursor as a catalyst in the catalytic cracking mode in vacuum. The method takes the composite metal oxide as the catalyst, so that the preparation is simple to carry out; by applying the prepared catalyst to blue alga cracking, the yield of the biologic oil can be effectively improved; moreover, as the metal oxide can absorb the moisture in the blue algae, the quality of the biologic oil is improved. The method disclosed by the invention is simple, the blue algae which is the chief culprit of eutrophication to a water body is taken as the raw material, the waste is turned into wealth, and the environment pollution is alleviated.

The invention discloses equipment for purifying trichlorosilane. The equipment is a first rectifying and purifying device and used for conducting first rectifying and purifying treatment on trichlorosilane so as to obtain purified trichlorosilane and first rectifying residual liquid, wherein the first rectifying and purifying device consists of a first rectifying tower, a second rectifying tower and a third rectifying tower which are connected in series, the rectifying of the first rectifying tower is conducted at the temperature of 60-100DEG C and the pressure of 0.2MPa according to the reflux ratio of (10-50):1; the rectifying of the second rectifying tower is conducted at the temperature of 100-140DEG C and the pressure of 0.5MPa according to the reflux ratio of (20-50):1; the rectifying of the third rectifying tower is conducted at the temperature of 60-80DEG C and the pressure of 0.2MPa according to the reflux ratio of (20-50):1. The equipment can be utilized for effectively purifying the trichlorosilane, and is simple, safe, energy-saving and environment-friendly and low-cost in technique, the purity of the purified trichlorosilane is high, the purified trichlorosilane can be effectively utilized for producing polycrystalline silicon, and the produced waste liquor can be recycled.

The invention discloses a method for producing a needle coke raw material by using a delayed coking process. In the method, full-range coal tar is imported to the top and the middle and a high-temperature conventional coking raw material is imported to the bottom; the high-temperature oil gas generated by the conventional coking raw material via high-temperature cracking is mixed with the full-range coal tar with lower temperature at the top and the middle of a reactor so that the full-range coal tar can crack hydrocarbon molecules with high reaction activity at a proper high temperature to achieve the aim of desorption; for the full-range coal tar, under the condition of the delayed coking process, asphaltene and partial colloid are condensed to form coke which is deposited in a coking tower so as to remove the components going against the production of the needle coke; furthermore, by means of the injection of the low-temperature full-range coal tar, the cracking temperature of the conventional coking raw material is reduced, the high-temperature cracking time of the conventional raw material is shortened, the secondary reaction is decreased, the coke generation rate is reduced and the stable operation period of a single tower is prolonged.

The invention relates to a method and device for producing a coal gas by pulverized coal pyrolysis. The coal gas production method disclosed by the invention comprises the following step: with an unpurified raw gas which is obtained from raw coal by dry distillation pyrolysis as a raw material, producing the high-quality coal gas inside a regenerative chamber in a pyrolysis manner. The device disclosed by the invention comprises a raw coal drying oven, a dry distillation furnace, a regenerative chamber for pyrolyzing the raw gas, and a hot blast heater for supplying heat. The raw gas is pyrolyzed to produce the coal gas, water vapor in the raw gas reacts with coke powder to produce a water gas, and meanwhile tar is cracked into the coal gas, so as to serve multiple purposes. The method and device disclosed by the invention have the advantages of low energy consumption, low investment, high calorific value of the gas, low semicoke ash and low coal quality transformation cost.

The invention discloses equipment for preparing trichlorosilane. The equipment comprises a hydrochlorination synthesis reaction device, and a first distillation purification device, wherein the hydrochlorination synthesis reaction device is used for carrying out hydrochlorination synthesis reaction on ganister sand, hydrogen and at least one material selected from hydrogen chloride and silicon tetrachloride, so as to obtain a hydrochlorination synthesis reaction product containing the trichlorosilane; the first distillation purification device is used for carrying out first distillation purification treatment on the hydrochlorination synthesis reaction product containing the trichlorosilane, so as to obtain the trichlorosilane and first refined raffinate. By using the equipment, the trichlorosilane can be effectively prepared; the process related to the equipment is simple, safe, energy-saving and environment-friendly, low in cost, and high in purity of produced trichlorosilane; the generated tail gas and waste residue can be recycled, so as to achieve the environmental requirements.

The present invention relates to a graphene modification current collector prepared by employing plasma-assisted chemical vapor deposition and a preparation method thereof. The graphene modification current collector comprises a substrate and a grapheme thin film having a three-dimensional continuous structure formed by mutual connection of grapheme nanosheets vertically grown at the surface of the substrate. The graphene modification current collector can effectively reduce the internal resistance of an electrode and can improve the high-power performance of the battery.

The invention discloses a method for the chemical gas-phase permeation compaction of a carbon/carbon composite material. The method comprises the following steps: putting a porous carbon fibre prefabricated body into a vacuum deposition furnace, vacuumizing the vacuum deposition furnace, keeping the vacuum, then setting furnace pressure and furnace temperature, introducing natural gas or the mixedgas of the natural gas and acetylene as a gas precursor body, keeping the gas precursor body being remained in the vacuum deposition furnace and carrying out isothermal isopiestic chemical gas-phasecompacting processing, wherein the volume ratio of the natural gas to the acetylene is 4-9:1. The invention has simple technology, low cost, high carbon deposition efficiency and large permeation depth, is not easy to generate an incrustation on the surface of the carbon/carbon composite material and is beneficial to shortening the compaction period of the carbon/carbon composite material.

The invention discloses an apparatus for continuously cracking beta-pinene to produce laurene. The apparatus comprises a charging pump, a vaporizer, a cracker, a heat exchanger, a cooler and a product collector which are sequentially connected; the charging port of the charging pump is connected with a raw material tank, the discharging port of the charging pump is connected with the upper end of the vaporizer through a guide tube, a nonvolatile matter collector is connected below the vaporizer, a gas mixing chamber is arranged above the vaporizer, the heat conduction material inlet and the heat conduction material outlet of the vaporizer are respectively connected with an eduction tube in front of and behind the eduction tube valve of the cracker, the gas mixing chamber is connected with the heat conduction material inlet of the heat exchanger, the heat conduction material outlet of the heat exchanger is connected with the charging port of the cracker, the charging port of the heat exchanger is connected with the discharging port of the cracker through a valve, and the heat exchanger is connected with the product collector. The apparatus has the advantages of low energy consumption, high reaction efficiency, uniform heating, low cost, high laurene output and realization of continuous cracking production of laurene.

The invention discloses a method for producing myrcene by cracking beta-pinene. The method comprises the following steps: vaporizing a beta-pinene mixture of which the beta-pinene content is over 95 percent in vacuum; mixing nitrogen with gas generated after vaporization of the beta-pinene mixture in a ratio of 1:1-5; preheating mixed gas obtained by mixing; performing a cracking reaction on the preheated gas through a cracking tube; and performing two-stage cooling on a cracking product to form liquid, wherein a catalyst layer is arranged on the inner wall of the cracking tube; the temperature of the cracking tube is 350-500 DEG C; the vacuum degree in vacuum vaporization is between -0.075MPa and -0.098MPa; the vaporization temperature is 80-110 DEG C; the mixing temperature is 90-120 DEG C; and the preheating temperature is 120-250 DEG C. Through adoption of the method, the problems of high production energy consumption and low yield in the conventional myrcene can be solved.