32 results about "Amyl ether" patented technology

The invention discloses a synthetic method of tert-amyl ethyl ether (TAEE). The method uses 2-methyl butene and ethyl alcohol as raw materials, and aluminum based composite metal oxide loaded with cesium acid phosphotungstate as a catalyst, and carries out synthesis of TAEE under the following conditions: reaction temperature of 100-180 DEG C, reaction pressure of 2.0-6.0MPa, liquid hourly volume space velocity of 2-methyl butene of 1.0-5.0 / h, and molar ratio of ethanol and 2-methyl-butane of 1.0:1-8.0:1. The method uses a fixed bed process for continuous synthesis of TAEE, and has the advantages of high conversion rate of raw materials and long running period.

The invention provides a purification technology of methyl tert-amyl ether purity standard substance raw material, comprising steps: (1) precision rectification: under normal pressure, adding industrial-grade methyl tert-amyl ether into a rectification tower, the rectification tower Built-in packing, obtain the methyl tert-amyl ether product from the top of the rectification tower, discard the front fraction with more impurities to obtain the sample to be adsorbed; (2) adsorption: at normal temperature, transfer the sample to be adsorbed obtained in step (1) to Adsorption tower, the adsorption tower has a built-in adsorbent, and the methyl tert-amyl ether product is obtained from the bottom of the adsorption tower; (3) Filtration: at normal temperature, the methyl tert-amyl ether product obtained in step (2) is passed through an organic microporous membrane Filter to obtain high-purity methyl tert-amyl ether. The purification technology of the present invention can solve the difficulty in the prior art that various trace impurities are difficult to remove, and the obtained methyl tert-amyl ether has a purity higher than 99.9%, less impurities and can be used as a standard substance.

The invention discloses a method for preparing high-quality mercaptoacetic acid from a tail solution from O-alkyl-N-alkyl thinocarbamate production. The method comprises the following steps: (1) performing acidizing treatment on the tail solution by using an inorganic acid, and controlling the pH value to be 0.5-1.5; (2) leaving to stand for 6-48 hours, separating suspended organic matters, extracting by using an organic solvent, and extracting by using an extraction agent, thereby obtaining an extraction liquid, wherein the volume ratio of the total amount of the organic solvent to an acidifying liquid is (2.5:0.01)-(2.5:0.1), the organic solvent consists of 40-60wt% of glutaric acid diethyl ester and 40-060wt% of ethyl malonic acid diethyl ester, the volume ratio of the total amount of the extracting agent to a new acidifying liquid is (2:0.1)-(2:2), and the extracting agent is prepared by mixing n-amyl ether, isoamyl ether and sec-butyl methyl ether in a mass ratio of (1-3):(1-3):(1-3); (3) removing the solvent and water from the extraction liquid, thereby obtaining crude acid; (4) performing flash evaporation on the crude acid. The method is high in recycling rate, high in product purity, good in quality and simple in process.

The invention discloses a synthesis method of oseltamivir. The synthesis method of oseltamivir comprises the following steps: starting from a compound 1,3-butadiene-3-amyl ether and compound 3-nitro-ethyl acrylate, carrying out Diels-Alder reaction, then reacting at room temperature in acetonitrile in the presence of a copper catalyst and PhI-NNs to prepare an aziridine compound in a one-pot method, wherein the mole ratio of the 1,3-butadiene-3-amyl ether to 3-nitro-ethyl acrylate to the copper catalyst is 1.1: 1: 0.025-0.1; and finally synthesizing the oseltamivir for preventing bird flu through the aziridine ring opening, nitryl and p-nitrobenzene sulfonyl removal, acetylation and hydrogenation. The method comprises short steps, the used reagent is cheap and easily available, the operation is simple, the total yield is up to 40%, and the method is a simple and efficient synthesis method of oseltamivir.

The invention discloses a method for modifying a sulfonic cation exchange resin, and a methyl tert-amyl ether preparation method. According to the present invention, a sulfonic cation exchange resin is soaked in a low-carbon alcohol solvent, and the soaked sulfonic cation exchange resin is subjected to gas stripping treatment with an inert gas, such that the specific surface area and the pore sizestructure of the resin are improved, and the stability and the selectivity of the sulfonic cation exchange resin catalyst are improved; and with the application of the modified resin as the catalystin the preparation of methyl tert-amyl ether at a temperature of 80-160 DEG C under a pressure of 0.1-3.0 MPa by using C5 olefin and methanol as raw materials, the continuous production can be achieved, the advantages of high conversion rate, good stability and the like can be provided, and the method is the new environmentally friendly process.

The invention discloses a cation exchange resin modification method and a methyl tert-amyl ether preparation method. According to the present invention, a sulfonic cation exchange resin is soaked sequentially with toluene and methyl isobutyl ketone, and soaking in stages is performed with distilled water, such that the specific surface and the pore size structure of the resin can be improved, andthe stability and the selectivity of the sulfonic cation exchange resin catalyst can be improved; and with the application of the modified resin as the catalyst in the preparation of methyl tert-amylether at a temperature of 75-250 DEG C under a pressure of 0.5-3.0 MPa by using C5 olefin and methanol as raw materials, the continuous production can be achieved, the advantages of high conversion rate, good stability and the like can be provided, and the method is the new environmentally friendly process.

The invention relates to a comprehensive processing method for olefins in Fischer-Tropsch synthesis light distillate oil. The high-temperature Fischer-Tropsch synthesis C5 light distillate oil is used as raw material, and the raw material is extracted and rectified, and the extractant is N, N-dimethyl formazan Amide, the enriched 1-pentene material obtained at the top of the extractive distillation tower, is further purified by precision rectification to obtain 1-pentene product, and the C5 component and extractant mixture obtained at the bottom of the tower enter the solvent recovery tower for recovery Extractant for recycling; the carbon five components obtained from the top of the solvent recovery tower are subjected to olefin isomerization through the isomerization reactor; the carbon five components rich in isomerized olefins obtained from the isomerization reactor are mixed with methanol enter the etherification reactor together for etherification reaction; the outlet material of the etherification reactor enters the catalytic rectification tower, and realizes the separation of the product methyl tert-amyl ether while carrying out the etherification reaction in the catalytic rectification tower. At the bottom of the distillation tower, the industrially required methyl tert-amyl ether product is obtained. The invention obtains high value-added carbon pentaolefin 1-pentene and clean high-octane gasoline additive methyl tert-amyl ether through deep processing of Fischer-Tropsch carbon five distillate oil.

The present invention provides a methyl tert-amyl ether preparation method. According to the present invention, a strong acid cation exchange resin catalyst suitable for catalyzing the etherificationbetween C5 olefin and methanol is placed into a low-carbon alcohol solution and is subjected to high-temperature high-pressure treatment, such that the specific surface and the pore size structure ofthe resin can be improved, and the stability and the selectivity of the sulfonic cation exchange resin catalyst can be improved; and the methyl tert-amyl ether is prepared at a temperature of 80-200 DEG C under a pressure of 0.1-4.0 MPa by using C5 olefin and methanol as raw materials, such that the continuous production can be achieved, the advantages of high conversion rate, good stability and the like can be provided, and the method is the new environmentally friendly process.