36 results about "Methyl acetylene" patented technology

The invention provides a catalytic rectification method for removing methyl acetylene and propadiene (MAPD) by selective hydrogenation. The method comprises the following steps of: placing a catalytic rectification member below a C3 fraction feeding position of a propylene rectification tower, introducing hydrogen into the tower from the lower part of the catalytic rectification member, and making the hydrogen upwards flow through the catalytic rectification member; and directly feeding the C3 fraction containing the MAPD into the propylene rectification tower or feeding the C3 fraction whichis pre-transformed through a first MAPD reactor into the propylene rectification tower to perform catalytic rectification and remove MAPD, directly recovering propylene meeting the polymerization level requirement from a lateral line, or recovering the material from the top of the tower, and removing light components to obtain polymerization level propylene, wherein the molar fraction of the MAPDin the tower can be directly reduced to below 0.1 to 2 percent. The method is characterized in that: by using the characteristic of low concentration of the propylene in the propylene rectification tower, the probability of side reaction of transforming the propylene into propane can be reduced, the selectivity of MAPD transformation is improved, and the purpose of high propylene yield is fulfilled.

The present invention provides new highly-efficient separation processes and systems for separating polymerization-grade ethylene and propylene from an initial effluent stream comprising ethane, ethylene, propylene, dimethyl ether, and one or more of propane, acetylene, methyl acetylene, propadiene, methane, hydrogen, carbon monoxide, carbon dioxide and C4+ components. In one embodiment, the initial effluent stream is provided from a methanol-to-olefin reaction system. It has been discovered that an efficient separation of these components is realized when DME is partially removed in a first separation step comprising methanol and water washing steps, followed by separation of the remaining components in additional separation steps.

A method for operating an integrated system for producing olefins may include contacting a hydrogenation feed with a first hydrogenation catalyst to produce a hydrogenated effluent, the hydrogenation feed including at least a portion of a first process effluent from a first olefin production process and at least a portion of a second process effluent from a second olefin production process. The hydrogenation feed may include at least hydrogen, ethylene, carbon monoxide, acetylene, methyl acetylene, and propadiene, and the first hydrogenation catalyst may be a hydrogenation catalyst having a temperature operating range of at least 40° C. The hydrogenated effluent may include methyl acetylene, propadiene, or both. The method may further include contacting at least a portion of the hydrogenated effluent with a second hydrogenation catalyst, which may cause hydrogenation of at least a portion of the methyl acetylene and propadiene to produce an MAPD hydrogenated effluent.

A process for the production of organic acids having at least three carbon atoms comprises the steps of forming an amount of carbon monoxide and reacting the amount of carbon monoxide with an amount of an unsaturated hydrocarbon. The reaction is preferably carried out in the presence of a supported palladium catalyst, a strong acid, and a phosphine. In some embodiments, the unsaturated hydrocarbon is one of acetylene and methylacetylene, and the organic acid is one of acrylic acid and methyl acrylic acid. The reacting step is preferably performed with carbon monoxide produced from carbon dioxide.

A selective hydrogenation process that is particularly effective in selectively hydrogenating alkynl compounds, such as acetylene or methyl acetylene, over alkenyl compounds, such as ethylene, is described. The process utilizes a slurry conversion unit for heat efficiency purposes during the conversion of acetylene into ethylene.

The invention relates to a control method in the fields of chemical engineering and system engineering, in particular to an advanced control system for a rectification device in butadiene production. The technical solution of the present invention is: an advanced control method for a butadiene rectification device, the rectification device includes a first rectification tower and a second rectification tower, and the method includes the following steps: using a measuring instrument to obtain The real-time data of the measurement point of the first rectification tower; start the soft-sensing model, filter the real-time data and input it into the soft-sensing model, and measure the water content in the bottom of the first rectification tower; start the soft-sensing model, and filter the real-time data Input the soft sensor model to measure the methyl acetylene content at the top of the first rectification tower; according to the soft sensor model, the water content in the bottom of the first rectification tower and the methyl acetylene content at the top of the tower are calculated on the basis of DCS Real-time online closed-loop optimization control of product quality in the first distillation column.

A method for synthesizing methyl acrylate by carbonylation of acetylene. The invention provides a method for synthesizing methyl acrylate by carbonylation of acetylene, using acetylene, methanol and carbon monoxide as reaction raw materials, under the condition of reaction temperature of 30-80°C and initial pressure of 1.2-6.5MPa, using organic ligands A polymer-supported palladium-based catalyst catalyzes the carbonylation of acetylene to synthesize methyl acrylate. The present invention adopts 2-pyridyl diphenylphosphine (2-PyPPh2) as an organic ligand, connects a vinyl group to prepare vinyl 2-pyridyl diphenylphosphine, and performs hinge polymerization under certain conditions to form a solid organic ligand. The organic ligand polymer (N-PPOL) is prepared by complexing the organic ligand polymer and immobilizing palladium acetate to prepare the organic ligand polymer-immobilized palladium-based catalyst. The one-step carbonylation of acetylene into methyl acrylate has the advantages of high activity, high selectivity, and excellent performance of easy separation and recycling.

The invention discloses preparation methods and applications for a terpyridine compound and a terpyridine metal complex. The preparation method for the terpyridine compound comprises the following steps: subjecting carbazole, bromohexane and a sodium hydroxide aqueous solution with the concentration of 50% to a substitution reaction in a DMSO solvent system at 50 DEG C; subjecting a compound 1 andNBS to a regioselective bromination reaction in a dichloromethane solvent system at 25 DEG C; subjecting bromobenzaldehyde, trimethylsilylacetylene, cuprous iodide and (beta-4)-platinum to a Sonogashira coupling reaction in a nitrogen gas environment and a dry diisopropylamine solution system at 80 DEG C; subjecting a compound 2, a compound 3, cuprous iodide and (beta-4)-platinum to a Sonogashiracoupling reaction in a nitrogen gas environment and a dry diisopropylamine and tetrahydrofuran solution system; and subjecting an alkyne-containing compound 4, diacylpyridine and potassium hydroxideto a Krohnke intermediate cyclization process reaction in an ethanol solvent system at 25 DEG C. The preparation method for the terpyridine compound provided by the invention has simple synthetic steps and mild conditions, and realizes multi-color printing and encrypted printing under visible sunlight.

The invention relates to a polypyrazole containing a xanthene structure and a preparation method thereof, specifically: three diyne monomers containing a xanthene structure 9,9-di(4-ethynylphenyl)xanthene, 9 ,9-bis(3-methyl-4-ethynylphenyl)xanthene and 9,9-bis(4-propargyloxyphenyl)xanthene, respectively with terephthaloyl dichloride and hydrazine hydrate or Phenylhydrazine undergoes "multi-component series" polymerization reaction, and a new type of polypyrazole containing xanthene structure is prepared. The functional polypyrazole of the present invention has good performances such as heat resistance, light transmission, dissolution and film formation due to the introduction of bulky xanthene structural groups into its main molecular chain, and has potential application prospects.

The invention discloses a preparation method of 2-methyl-1-ethynyl-2-penten-1-ol, wherein the preparation method comprises the steps: firstly, introducing chloromethane into tetrahydrofuran and magnesium chips, carrying out a Grignard reaction, and generating methyl magnesium chloride; cooling, adding a catalyst, and introducing acetylene to generate acetylene magnesium chloride; and after completion of the reaction, dropwise adding 2-methyl-2-pentenal, hydrolyzing with dilute hydrochloric acid, washing an organic layer by water, carrying out reduced pressure distillation, and rectifying a residual material to obtain 2-methyl-1-ethynyl-2-penten-1-ol. The method is easy to operate, cheap and easily obtained chloromethane is used as a raw material, dangerous sodium amide or liquid ammonia isnot used, and tetrahydrofuran, toluene and other solvents can be reused, the product yield is high, the purity is high, and the cost is low.

A selective hydrogenation method is particularly effective in selectively hydrogenating alkynyl compounds, such as acetylene or methyl acetylene, over alkenyl compounds, such as ethylene. The method produces a relatively high quantity of heat during the selective hydrogenation reaction. This production of heat is, however, quite beneficial in that enough heat is produced such that a substantial portion of the produced heat can be recovered for heat efficiency purposes.

The invention provides a catalytic rectification method for removing methyl acetylene and propadiene (MAPD) by selective hydrogenation. The method comprises the following steps of: placing a catalytic rectification member below a C3 fraction feeding position of a propylene rectification tower, introducing hydrogen into the tower from the lower part of the catalytic rectification member, and making the hydrogen upwards flow through the catalytic rectification member; and directly feeding the C3 fraction containing the MAPD into the propylene rectification tower or feeding the C3 fraction whichis pre-transformed through a first MAPD reactor into the propylene rectification tower to perform catalytic rectification and remove MAPD, directly recovering propylene meeting the polymerization level requirement from a lateral line, or recovering the material from the top of the tower, and removing light components to obtain polymerization level propylene, wherein the molar fraction of the MAPDin the tower can be directly reduced to below 0.1 to 2 percent. The method is characterized in that: by using the characteristic of low concentration of the propylene in the propylene rectification tower, the probability of side reaction of transforming the propylene into propane can be reduced, the selectivity of MAPD transformation is improved, and the purpose of high propylene yield is fulfilled.

A process is provided to separate a hydrocarbon stream comprising a mixture of light olefins and light paraffins, the process comprising sending the hydrocarbon stream through a pretreatment unit to remove impurities selected from the group consisting of sulfur compounds, arsine, phosphine, methyl acetylene, propadiene, and acetylene to produce a treated hydrocarbon stream; vaporizing the treated hydrocarbon stream to produce a gaseous treated hydrocarbon stream; adding liquid or vapor water to the gaseous treated hydrocarbon stream; then contacting the gaseous treated hydrocarbon stream to a membrane in a membrane system comprising one or more membrane units to produce a permeate stream comprising about 96 to 99.9 wt % light olefins and a retentate stream comprising light paraffins.