7 results about "Mixed cresols" patented technology

The application belongs to the technical field of chemical industry, and particularly relates to a mixed cresol separation method, which comprises selective oxidation, filtration, neutralization, secondary filtration and rectification processes in sequence. The selective oxidation comprises: adding mixed cresol, sodium hydroxide, sodium methoxide, a solvent and a catalyst into an oxidation kettle, heating, and introducing oxygen for selective oxidation. In the selective oxidation step, sodium methoxide is added, which can react with water obtained in a salification reaction step (i.e. a reaction step of sodium hydroxide and mixed cresol to generate sodium phenate and water) to generate methanol and sodium hydroxide, thereby promoting the selective oxidation reaction and improving the yield.

The application discloses a kind of for mixed cresol separation continuous amplification production process and method, belong to mixed cresol separation and purification field.This process solves the problem of low flow, difficult to control, temperature-resistant equipment selection difficult in early stage working condition exploration, proposes the design concept of "breathing mouth".Further, a kind of "exogenous" online detection system can effectively avoid the influence of analysis results due to excessive flow temperature, excessive pressure, high concentration, reduce the complexity of structure design;For the problem of large amount of desorbent, an efficient desorbent extraction system is proposed, which can realize efficient recovery of desorbent and separation and purification of m-cresol product.The process and method are scientific and reasonable, and can realize continuous production, and have important role in mixed cresol separation amplification production.At the same time, it also has wide applicability in other chemical amplification production, separation and purification fields.

The invention belongs to the field of synthesis and separation of coalification products, and particularly relates to a method for separating various phenols from mixed cresol. According to the method, the mixed cresol is used as a raw material, ethyl in o-ethyl phenol in the m-cresol / o-ethyl phenol mixture is removed through the dealkylation catalyst to generate phenol and ethylene, and due to the fact that the ethyl removal reaction is carried out in the presence of the specific catalyst at a low temperature, few methyl in phenolic substances can be subjected to removal and transposition reactions; the method comprises the following steps: firstly, decomposing ethylene, then quantitatively reacting the ethylene obtained by decomposition with o-cresol in a 2, 6-xylenol crude product under the catalysis of a cresol aluminum catalyst to generate 2-ethyl-6-cresol, and rarely reacting with 2, 6-xylenol to generate 4-ethyl-2, 6-xylenol, thereby achieving the purpose of purifying 2, 6-xylenol. The lysate and the alkylation reaction liquid are respectively rectified to obtain high-quality phenol, m-p-cresol, 2, 6-xylenol and 2-ethyl-6-cresol, and the method is simple and easy to operate, few in three wastes and low in production cost.

The invention relates to a method for adsorbing and separating an m-cresol and p-cresol mixture, which is characterized in that efficient separation of m-cresol and p-cresol is realized by preparing a molecular sieve adsorbent with a high silica-alumina ratio and combining a static liquid phase adsorption process. The preparation method of the molecular sieve adsorbent comprises the following steps: pretreating molecular sieve raw powder, mixing the pretreated molecular sieve raw powder with silica sol and sesbania powder for molding, and performing chemical deposition and roasting for multiple times through tetraethyl silicate to realize surface silicon modification, thereby finally preparing the adsorbent with the mechanical strength of 10-58N / mm < 2 >. During separation, the mixed cresol is dissolved in the unsym-trimethylbenzene, the adsorbent selectively adsorbs the p-cresol, and the purity of the intermediate cresol in the mother liquor reaches 99% or above; after the p-cresol in the adsorbent is eluted by toluene, the adsorbent can be repeatedly used for 20-80 times. The method is mild in operation condition, simple in process and low in energy consumption, solves the separation problem caused by approximate boiling point in the traditional rectification method, is suitable for an industrial fixed bed or simulated moving bed system, and is high in separation efficiency and low in cost.

The present invention belongs to the technical field of chemical engineering, and specifically relates to a method for separating mixed cresols. The method for separating mixed cresols comprises the successive steps of selective oxidation, filtration, neutralization, secondary filtration and rectification, wherein the selective oxidation comprises: adding mixed cresols, sodium hydroxide, sodium methoxide, a solvent and a catalyst to an oxidizing kettle, heating same, and introducing oxygen into the oxidizing kettle to perform selective oxidation. In the present invention, sodium methoxide is added in the step of selective oxidation; and sodium methoxide can react with water obtained in the step of a salt forming reaction (i.e., the reaction step of reacting sodium hydroxide with mixed cresols to generate sodium phenolate and water) to generate methanol and sodium hydroxide, thereby promoting the progression of a selective oxidation reaction and increasing the yield.

The present invention relates to the technical field of m-cresol and p-cresol production, and specifically discloses a method for preparing m-cresol and p-cresol: (1) subjecting a raw material containing phenol oil to a first distillation to obtain mixed cresol I; (2) subjecting the mixed cresol I to a second distillation to obtain o-cresol and mixed cresol II; (3) contacting the o-cresol with an isomerization catalyst to carry out an isomerization reaction, and the obtained isomerized product is returned to the raw material; and (4) subjecting the mixed cresol II to adsorption separation to obtain m-cresol and p-cresol. The method provided by the present invention couples distillation, isomerization, and adsorption separation, and has the advantages of high phenol oil utilization, high o-cresol conversion rate, and high purity of m-cresol and p-cresol, and is suitable for industrial promotion.

The application discloses a mixed cresol type benzoxazine and a preparation method thereof. All materials are heated and sprayed into a reaction container in a mist state, so that the materials are mixed and preliminarily reacted before gathering at the bottom of the reaction container, the mixed cresol type benzoxazine generated in the reaction is prevented from affecting the reaction between unreacted materials in the reaction system too early, and the yield of the mixed cresol type benzoxazine is improved.