30 results about "P-tolualdehyde" patented technology

The invention provides a preparation method of methyl 4-methylcinnamate. The preparation method comprises the following steps: stir-mixing glycol dimethyl ether which is used as a solvent, lithium diisopropylamide which is used as a catalyst, and methyl acetate, and slowly adding p-tolualdehyde in a dropwise manner under stirring at below 5DEG C; reacting for 3-6h at 0-10DEG C after ending the dropwise addition, and slowly adding sulfuric acid with the mass percent of 10% in a dropwise manner to regulate the pH of a reaction solution between 6.8-7.2; and separating the resulting organic layer, carrying out reduced pressure distillation to recover the solvent and excess p-tolualdehyde and obtain a white solid, washing the white solid with water, drying to obtain crude methyl 4-methylcinnamate, and recrystallizing the crude methyl 4-methylcinnamate to obtain methyl 4-methylcinnamate. The preparation method which has the advantages of low costs of raw materials, mild reaction condition, preparation of methyl 4-methylcinnamate through a one-step reaction, simplicity, easy operation, high yield, stable and reliable product quality, and no pollution to environment is a green synthetic method.

The invention provides an oxaphosphaphenanthrene fire retardant containing cyclotriphosphazene and cup [4] aromatic ring structures as well as a preparation method and application of the oxaphosphaphenanthrene fire retardant. The preparation method comprises the steps that hexa-p-hydroxy phenoxy cyclotripolyphosphazene and DOPO react in an organic solvent to obtain an oxaphosphaphenanthrene intermediate I containing a cyclotriphosphazene structure; p-toluenesulfonate ethoxyl p-tolualdehyde and p-tertiary butyl cup [4] aromatic hydrocarbon react under the action of acetonitrile-K2CO3 to obtain an intermediate II; the intermediate I, the intermediate II and hydrazine hydrate react in the organic solvent to obtain the oxaphosphaphenanthrene fire retardant containing the cyclotriphosphazene and cup [4] aromatic ring structures. The oxaphosphaphenanthrene fire retardant containing the cyclotriphosphazene and cup [4] aromatic ring structures is white in appearance, melting point is 212-214 DEG C, thermal stability is good, flame retardant rate is high, and purity is 99.1%; the used raw materials are available, a technology is advanced, and industrial production can be easily realized. The oxaphosphaphenanthrene fire retardant containing the cyclotriphosphazene and cup [4] aromatic ring structures can be taken as a reactive type fire retardant and can also be taken as an additive flame retardant when being used after being grafted to thermosetting resins of epoxy resin, polyurethane and the like, so as to meet the halogen-free fire retardant requirement of engineering plastics, with high heat resistance requirement on fire retardant, such as ABS, nylon and the like.

The invention relates to a method for preparing p-tolualdehyde by efficiently catalyzing p-xylene by polyoxometallate. Polyoxometallate as a catalyst is placed in a reactor, an organic solvent and p-xylene are sequentially added to the reactor, finally, an oxidizing agent is added, a stirring reaction is performed at 50-80 DEG C for 12-48 h, and p-tolualdehyde is separated. Compared with the priorart, the method is simple to operate and mild in condition and is a p-tolualdehyde preparation method with atom economy and environmental friendliness, the conversion rate of p-xylene and selectivityof p-tolualdehyde are high, and the catalyst has the characteristics of being green, efficient, easy to recycle and the like and has promotion and utilization values.

The invention relates to a glue-spraying type pest attractant. The attractant comprises the following components in parts by weight: 90-95 parts of pest sticking glue, 3-8 parts of insect pheromone, 0.1-3 parts of 3-phenylpropionaldehyde and 0.1-3 parts of eucalyptol. The insect pheromone is prepared from anisaldehyde, p-tolualdehyde, ethyl 3- piperidinecarboxylate, 4-anisaldehyde, citronellol andeugenol according to the mass ratio of (1-15):(1-15):(1-15):(1-5):(1-5):(1-5). According to the invention, the compounded 3-phenylpropionaldehyde and the eucalyptol are used as plant-source synergists and can improve the attracting effect of the insect pheromone by 20%-35%. Meanwhile, the oily glue is utilized as a release agent and is sprayed on appliance surfaces, and when a diluent is volatilized, the high binding character of the colloid is utilized for high efficiently attracting and killing pests. The pest attractant provided by the invention meets the urgent requirements of glue-spraying type pest attractants with no public nuisance, high efficient attraction, good stickiness, high strength, good stability, simple and convenient operation and low cost on the market, and has a widemarket prospect.

Disclosed is a method for producing p-xylene and / or p-tolualdehyde with high yield through a short process using biomass resource-derived substances as raw materials. The method for producing p-xylene and / or p-tolualdehyde of the present invention comprises: a cyclization step of producing 4-methyl-3-cyclohexenecarboxaldehyde from isoprene and acrolein; and an aromatization step of producing p-xylene and / or p-tolualdehyde from 4-methyl-3-cyclohexenecarboxaldehyde by gas-phase flow reaction using a catalyst(s).

The invention provides a novel process of a 1,4-bis(methoxymethyl)-benzene preparation method. The novel process comprises the following steps of: (1) reaction distillation: heating low-boiling leftovers containing p-xylylene dichloride to reach the temperature above 110 DEG C, pumping into a reaction kettle under vacuum; adding sodium methoxide solution to react and distil at temperature below 80 to 100 DEG C, stopping reaction to obtain a crude product while the content of the p-xylylene dichloride residual in a reactant accounts for 0.05 to 0.5% (GC), and distilling to obtain methanol; (2) salt dissolving: adding water to the crude product to dissolve salt; (3) heating reflux: heating for 3 to 5 hours to reach 95 to 105 DEG C; (4) standing and layering to obtain an oil layer and a water layer; (5) rectifying: performing reduced pressure distillation to the oil layer to obtain finished 1,4-bis(methoxymethyl)-benzene and a byproduct finished p-tolualdehyde. The novel process is simple, convenient and stable in operation process, active substance can be fully utilized and the generation of three wastes (waste gas, waste water, and industrial residue) is reduced in the process of producing the p-xylylene dichloride.