34results about How to "Avoid strong corrosive" patented technology

A non-halogen active agent for a flux is a sulfonate formed by a sulfonic acid reacting with an organic base. The sulfonic acid can be an alkyl sulfonic acid, alkyl disulfonic acid, hydroxyl sulfonic acid or halogenated sulfonic acid. The organic base can be an organic amine, carbamidine, imidazole, phosphorus. The non-halogen active agent for a flux has the advantage of high activity and low corrosion.

The invention relates to a waste reducing system and a method in the field of electronic information printed circuit boards. The invention solves the problems of strong corrosivity, high water content and difficult incineration in existing high-alkalinity water membrane slag, and provides a system and a method convenient for incineration after neutralizing and reducing water content. The technical scheme is as follows: acidic wastewater and high-alkalinity membrane slag are dehydrated by adopting a water control system after being neutralized. The system and the method have the following benefits: the high-alkalinity membrane slag can be neutralized, the water content is reduced, the reduction of membrane slag wastes is realized, and the wastes are conveniently incinerated, so that the treatment cost of the wastes is decreased.

The invention discloses a preparation method of graphene and the graphene. According to the preparation method of the graphene, graphene oxide is reduced by hydrogen-containing polysilane serving as a reducer, and the graphene is obtained. According to the preparation method, hydrazine hydrate, a derivative of hydrazine hydrate, hydrogen iodide, sodium borohydride and other substances with strong toxicity, high volatility and strong corrosion are avoided, and the method is safe and environment-friendly, requires mild conditions and can be used for batch production.

The invention relates to an alkylate waste sulfuric acid resourceful treatment device and method. The device is composed of a reaction flotation tower, a crystallizer, a heat exchanger, a mother solution circulation pump, a condensate pump and connecting pipelines between the components. Alkylate waste sulfuric acid and ammonia gas serve as inlet materials of the reaction flotation tower, and a high-temperature and high-pressure ammonium sulfate mother solution generated at the bottom of the tower enters a crystallizer; low-pressure steam generated by the reaction flotation tower is extracted from the top of the tower and enters an outer jacket of the crystallizer; polymerization oil in the alkylate waste sulfuric acid is subjected to floatation and extraction in reaction and floatation integrated equipment to obtain polymerization oil; the normal-pressure saturated ammonium sulfate mother solution crystallized in the crystallizer returns the reaction flotation tower through the mother solution circulation pump; generated crystals are extracted to serve as ammonium sulfate crystals; the normal-pressure steam generated in the crystallizer is condensed through the heat exchanger and then returns to the reaction flotation tower through the condensate pump; condensation water generated in the outer jacket of the crystallizer returns to the reaction flotation tower through the condensate pump. The method process is simplified, the operation time is shortened, and the method is environmentally friendly.

The invention relates to a method for extracting aurum from difficult-to-handle sulphide ore aurum concentrate by two-segment pressurization leaching method comprising two segments of pressurization oxidation preprocessing and pressurization oxidation aurum leaching. The method comprises the steps of: firstly, pressurizing and oxidizing base metal sulfide such as iron sulfide with sulfuric acid-iron sulfate, wherein most S2- and S22- are oxidized into elemental sulfur; and secondly, pressurizing and leaching the preprocessed slag with thiocyanate so that aurum is selectively dissolved in the solution in the form of aurum-thiocyanic acid compound. Therefore, the pre-oxidation slag can be directly leached without neutralization, the technical process is short, the aurum recovery rate is high, the cost is low and pollution of low-concentration SO2 smoke gas, As2O3 smoke dust, and the like is avoided.

The invention discloses a method for preparing cellulose acetate butyrate with high butyryl group content, which comprises the following steps: After the crushed cellulose is activated with acetic acid, under the catalysis of sulfuric acid, transesterification occurs with alkyl butyrate to generate high butyrate For cellulose acetate butyrate with acyl group content, the alcohol produced by rectification during the transesterification reaction promotes the positive reaction. In the cellulose acetate butyrate prepared by the method, the acetyl group content is 1-2 wt%, and the butyryl group content is 50-53 wt%. The invention adopts a non-corrosive esterification agent, the excess esterification agent can be recycled, greatly reduces the production cost, and is suitable for industrial production.

The invention discloses a method for synthesizing p-tert-butylphenylpropionaldehyde, which is carried out according to the following reaction formula: specifically, the steps are as follows: the unsaturated aldehyde is generated by the Claisen-Schmidt condensation reaction of formula I under alkaline conditions And the step of obtaining formula II; dissolving formula II in toluene and ethylene glycol under the action of a catalyst, fractionating water, and condensing to generate the step of formula III; dissolving formula III in a solvent, adding a catalyst, and feeding hydrogen under pressure Reducing the double bond to obtain the step of formula IV; hydrolyzing the acetal of formula IV into aldehyde under acidic conditions to obtain the step of formula V of p-tert-butylphenylpropionaldehyde. The method for synthesizing p-tert-butyl propionaldehyde of the present invention, compared with the prior art using Krafts acylation reaction, has mild conditions, strong selectivity of Claisen-Schmidt condensation reaction, high condensation unity, and avoids A large amount of highly corrosive titanium tetrachloride is used, causing serious pollution problems. The reaction synthesis of the invention has little pollution, simple aftertreatment, and meets the requirements of modern green production.

The invention relates to an activated carbon comprising a hierarchical hole channel structure and a production method thereof and belongs to the novel carbon material production field. The production method is based on the activation of the mechanical force auxiliary potassium carbonate on heavy carbon sources such as petroleum coke, coal, or phenolic resin. The production method comprises the specific steps of mixing the screened heavy carbon source powder with the potassium carbonate and obtaining the activated carbon for a super capacitor through the ball-milling, activation, washing and drying process. According to the activated carbon comprising the hierarchical hole channel structure and the production method thereof, the activated carbon is large in specific surface area, is of a hierarchical hole channel structure, and the like; the technical route that the potassium carbonate serves as a pore forming agent to produce the activated carbon is implemented and the problem that raw materials such as the petroleum coke and the coal cannot be activated by the potassium carbonate is solved; compared with potassium hydroxide and other activation methods, the corrosion is low, the adaptability to the raw materials is high, the specific surface area is large, the mesoporous pore capacity is large, the enlargement is easy, and the like; the novel activated carbon can be widely applied to the adsorption, catalysis, electrochemical energy storage and other fields and accordingly the application prospect is wide.

The invention relates to a biological oil removing agent for permanent-magnet materials. The biological oil removing agent is prepared according to the following steps: diluting the biological oil removing agent with water in the volume ratio of 1:(19-99) to obtain a diluent; and regulating the pH value of the diluent to 6.0-9.0 by using two of phosphoric acid, citric acid, sodium citrate and trisodium phosphate, and keeping the temperature of the diluent at 10-40 DEG C for later use. The biological oil removing agent can be used for thoroughly removing oil stains in the permanent-magnet material under the condition of mild pH value without generating substances harmful to the environment. The biological oil removing agent is environment-friendly. Meanwhile, microbes in the biological oil removing agent are cheap and are easy to obtain, and the biological oil removing agent has strong continuous oil removal capability, therefore, the oil removal cost can be greatly lowered by using the biological oil removing agent.