42results about How to "Avoid mass generation" patented technology

The invention relates to a method for preparing gem-diboron compounds by selective 1,1-diboration of olefins. The method refers to: dissolving olefin compounds, metallocene-based transition metal catalysts and base compounds in a solvent, and then adding Borane compounds react in a protective atmosphere at 60-150°C for 1-16 h, and then separate to obtain gem-diboron compounds. The invention has the advantages of simple and convenient operation, low cost, high atomic economy of reaction, and is suitable for industrialized production.

The invention relates to a steel casting normalizing solution and a steel casting normalizing cooling technique, belonging to the technical field of heat treatment of steel castings. The normalizing solution is a high-molecular polymer water solution. The high-molecular polymer water solution is composed of the following components in percentage by weight: 5-15% of polyvinyl alcohol, 10-25% of sodium polyacrylate, 0.5-1.0% of sodium carboxymethyl cellulose, 3-6% of additive and the balance of water. The steel casting normalizing solution and steel casting normalizing cooling technique improve the cooling uniformity, inhibit the pro-eutectoid phase, and solve the technical problems of poor mechanical anisotropy, poor impact toughness and low yield-tensile ratio.

The invention provides a curing agent for carboxyl resin as well as a preparation method and an application of the curing agent. The curing agent is prepared from main raw materials including phenyl polyacid, phenyl polyphenol, sodium hydroxide, allyl bromide, epichlorohydrin and a catalyst through joint reaction. The curing agent contains both epoxy groups and double-bond groups, so that the curing agent can be subjected to a reaction with carboxyl groups in branch chains of carboxyl acrylic resin and can also be subjected to a reaction with double bonds remaining in main chains, and a densefilm with higher crosslinking density is formed.

A hydrogenation method of nitrile latex belongs to the hydrogenation field of nitrile rubber latex. The disadvantages of the existing hydrogenation method of nitrile latex are that the cost is high and hydrogenated products generate cross bonding. The hydrogenation method of nitrile latex realizes hydrogenation through following technical scheme, respectively adding organic solvent and nitrile latex in two communicated reaction vessels and heating, when the temperature of the organic solvent reaching 130 to 145 DEG C and the temperature of the nitrile latex reaching 50 to 70 DEG C, keeping thetemperature constant for 4 to 48h, adding the derivative of hydrazine in the organic solvent in batches during the temperature constant period. The total amount of the added derivative of hydrazine is 1 to 3 times of the mole number of the carbon-carbon double bond in the hydrogenated nitrile latex. The method of the invention has the advantages of low cost and little pollution. The prepared hydrogenated nitrile latex has the advantages of low degree of cross linking and good processing property.

The invention provides brazing filler metal for brazing titanium alloy and steel or titanium aluminum alloy as well as steel. The brazing filler metal is characterized by comprising the following components in parts by weight: 0-40 parts of Ti, 24-50 parts of Cu, 6-23 parts of Ni, 5-20 parts of V and 9-35 parts of Zr. The brazing filler metal has a good wetting effect for both titanium alloy or titanium aluminum alloy base metal and steel base metal; large quantities of inter-brittle metal compounds can be prevented from being generated to a certain degree; and a high-strength brazing connector can be obtained by using the brazing filler metal.

The invention provides a harmless treatment method for solid sulfur melting of fly ash. The method includes: mixing fly ash, reducing agent, and flux to obtain mixed raw materials; wherein the molar ratio of C and S in the mixed raw materials is 2.5 to 3.5; the control slag type is SiO 2 ‑Al 2 o 3 ‑CaO slag type, and m / n is 0.8~1.5; or, the control slag type is SiO 2 ‑CaO‑FeO slag type, and m / n is 1.0~1.6, l / m=0.15~0.30; the mixed raw materials are sent into the electric furnace in the form of injection or pressed balls for sulfur solidification and melting, during which the temperature of the slag layer is controlled at 1250~1350°C, and control the temperature of the molten salt layer above the slag layer below 1200°C to obtain molten salt, slag and flue gas; cool the molten salt, and water-cool or air-cool the slag; use one of three methods Dispose of fumes. The invention provides a systematic solution for fly ash treatment from the aspects of batching, solid sulfur melting, flue gas treatment, etc., and realizes the maximum degree of harmless treatment.

The invention relates to a preparation process for propylene from methanol or dimethyl ether. The process comprises the following steps: allowing the raw materials consisting of methanol or dimethyl ether, water and above-C4 components returned from a separation system to undergo a reaction in a first reactor so as to produce propylene-rich C1-C10 components which enter into the separation system; separating propylene from the separation system as a product and allowing above-C4 components to return to the reactor; and subjecting C1-C2 components in the separation system to a reaction in a second reactor to produce above-C3 high-carbon substances and returning the above-C3 high-carbon substances to the separation system to promote yield of propylene; wherein selectivity of propylene in the first reactor is greater than 70%, and the yield of propylene after propylene-yield promotion by the second reactor is greater than 75%. Compared with the prior art, the process provided by the invention has the advantages of high selectivity of the product propylene, no need for an ethylene cryogenic fractionation system, low content of C2 and below-C2 components, simplification of the separation system and substantial reduction of energy consumption of the separation system.

The invention discloses a method for garbage low-nitrogen and low-dioxin grate incineration and a device of the method for garbage low-nitrogen and low-dioxin grate incineration. The device comprises a first channel and an incineration hearth which is arranged on the bottom of the first channel, wherein a blowing subassembly is arranged along the peripheral wall of the first channel and enables smoke in the first channel to form two groups of tangent circles and spirally ascend; and the smoke forms two groups of tangent circles and spirally ascends through the blowing subassembly in the first channel, the temperature of the first channel is controlled between 850 DEG C and 900 DEG C through regulating the air flow of a blowing nozzle of the blowing subassembly, the smoke residence time is above 2 seconds, the smoke flows to an outlet of the first channel finally, slag which is generated after garbage on the tail end of a grate is completely burnt is discharged through a slag discharge port, and accordingly, a garbage low-nitrogen and low-dioxin grate incineration process is completed. The method and the device have the advantages of high combustion efficiency, good environmental-friendly effect and low initial construction and operation cost, and are suitable for large, medium and small-scale treatment of industrial and urban garbage incineration.

The invention discloses a preparation method of polycarbonate-polyether diol, the number-average molecular weight of polycarbonate-polyether diol is 500-5000, comprising the following steps: (1) comprising epoxide, catalyst , initiator and carbon dioxide are imported into the premixing tank for premixing, and then introduced into the pipelined continuous reactor, and in the presence of the catalyst, the initiator, epoxy compound and carbon dioxide are contacted in the pipelined continuous reactor to carry out polymerization reaction; ( 2) The polymerization reaction product flow of step (1) is partly or completely flowed through the cooling section group, and part of the polycarbonate-polyether glycol is separated, and the remaining polymerization reaction product flow continues to be polymerized in a pipelined continuous reactor reaction, or cycle back to step (1); wherein, the catalyst is modified by mixed acid during synthesis, and obtained by reacting water-soluble metal salts of zinc and cobalt in a water-soluble solvent.