39 results about "Mixed cresols" patented technology

The invention discloses an engine carbon deposit combustion cleaning agent. The engine carbon deposit combustion cleaning agent is prepared from the following raw materials in percentage by weight: 60% to 80% of dibutyl carbonate, 0.2% to 1.5% of benzotriazole, 0.5% to 2.5% of mixed cresol, 3% to 8% of mixed trimethylbenzene, 3% to 8% of ethylene glycol monobutyl ether, 5% to 15% of n-octanol and 2% to 5% of cyclohexanol. In addition, the invention further discloses a preparation method for the cleaning agent. The engine carbon deposit combustion cleaning agent disclosed by the invention can be used for slowly and gradually stripping hard carbon deposits during the running of an automobile, effectively cleaning stubborn carbon deposits from all parts of an engine and recovering normal functions of the engine; meanwhile, the content of HC in automobile exhaust gas is lowered by 85% or more, the content of CO is lowered by 67% or more, the content of PM2.5 is lowered by 75% or more, and the exhaust emissions reach national V standards; the engine carbon deposit combustion cleaning agent has high octane number and cetane number and has the flash point above 55 DEG C, thereby being capable of being applied to diesel oil and gasoline.

The invention relates to a method for preparing pure p-cresol and pure m-cresol by separating industrial mixed p-cresol and m-cresol. In specific, the invention relates to a method for preparing pure p-cresol and pure m-cresol through a complexion separation method by taking industrial mixed p-cresol and m-cresol as the raw material. Compared with the separation method in the prior art, the method provided by the invention can obtain p-cresol product and m-cresol product at a time and comprises the advantages that through the coupling of separation processes of p-cresol and m-cresol, the proportion of p-cresol and m-cresol in the m-cresol extraction raw material is increased, the residual p-cresol and m-cresol are separated in a circulatory manner, and the extraction efficiency of m-cresol is improved to the greatest extent; three wastes are not generated in the whole separation process, the operation is carried out under ordinary pressure, the requirement on equipment is low, and the method belongs to an environment-friendly and green separation technological method.

The invention discloses a novel method for separating an m-cresol and p-cresol mixture to obtain high-purity m-cresol and p-cresol. The method comprises the following steps: carrying out alkylation reaction on the m-cresol and the p-cresol as raw materials under the existence of an alkylating agent and a catalyst to obtain the mixed solution of 2-tertiary butyl-p-cresol and 6-tertiary butyl-m-cresol; rectifying the mixed solution to obtain the products of high-purity 2-tertiary butyl-p-cresol and 6-tertiary butyl-m-cresol; respectively carrying out dealkylation reaction and rectification on the obtained high-purity 2-tertiary butyl-p-cresol and 6-tertiary butyl-m-cresol under the existence of the catalyst to respectively obtain the products of the high-purity m-cresol and p-cresol; and recovering isobutene generated by dealkylation. The invention has high reaction conversion rate, high atom use ratio, low raw material consumption and production cost and reliable safety performance.

The invention relates to a method for separating and purifying m-cresol from a mixture of m-cresol and p-cresol by using a complex crystallization method. The method comprises the following steps: 1) complex crystallization: adding a mixture of m-cresol and p-cresol into a reactor, adding urea and heating to 70-95 DEG C to completely dissolve the urea in the mixture of m-cresol and p-cresol; cooling, adding petroleum ether when the mixture is cooled 50-60 DEG C, wherein the adding amount of petroleum ether is 1-2 times the volume of the raw material of the mixture of m-cresol and p-cresol, and crystallizing at 0 DEG C-8 DEG C for 2-4 h; 2) solid-liquid separation washing to obtain white needlelike m-cresol complex crystals and a filtrate 1; 3) decomplexation: pumping the complex crystal and adding of toluene, decomplexing at 50-60 DEG C under the, and filtering while hot to obtain a solid urea and a filtrate 2, wherein the filtrate 2 is a mixture of m-cresol and toluene; and 4) distillation: separating m-cresol and toluene in the mixture filtrate 2 through vacuum distillation to obtain pure m-cresol and toluene.

The application provides a method for producing m-cresol, at least including the following steps: (1) passing material I containing m-cresol and p-cresol into an adsorption unit for adsorption separation to obtain m-cresol product; The adsorption unit contains one or more adsorbent beds, and at least one adsorbent bed includes a molecular sieve adsorbent; (2) the material II containing the desorbent is passed into the adsorption unit, and the adsorbent bed in the adsorption unit is Desorb to obtain the desorption material III; pass the desorption material III into the separation unit to separate and obtain the desorbent material IV and the mixed cresol material V; (3) return the desorbent stream IV obtained by separation in the step (2) to the adsorption unit for recycling (4) Pass the mixed cresol material V obtained in step (2) into the isomerization reaction unit for reaction to obtain the isomerization product material VI; the isomerization product material VI is returned to the adsorption unit.

The invention discloses a method for separation and purification of p-cresol. The method comprises the following steps: 1) complexation: adding toluene and a complexing agent of oxalic acid into a reaction kettle, heating, adding mixed cresol, insulating for reaction, and filtering to obtain a cresol- oxalic acid complex crude product; 2) purification: adding the p-cresol-oxalic acid complex crude product into a purification solvent, stirring and filtering to obtain a p-cresol-oxalic acid complex; 3) decomplexation: adding the p-cresol-oxalate complex into water, insulating for reaction, separating an upper organic phase while hot, extracting the lower aqueous phase by toluene, and merging the extraction liquid into the upper organic phase; and 4) distillation: distilling the upper organic phase to remove solvent so as to obtain p-cresol. Compared with the prior art, a purification step is added to ensure that the final isolated p-cresol has purity of no less than 99%; the amount of organic solvents is reduced, the complexation step employs water, and the organic solvent and water involved in the separation process can be used indiscriminately, thereby saving cost.