50 results about "Coal chemistry" patented technology

The disclosed technology relates to nanotechnology, petrochemistry, gas chemistry, coal chemistry, in particular to a catalyst based on carbon nanotubes for synthesis of hydrocarbons from CO and H2 and a preparation method thereof. The carbon nanotubes fixed in the catalyst pellet pores improve mass and heat transfer in the catalyst pellet and the catalyst bed.

The invention discloses a method of decomposing hydrogen sulfide for preparation of hydrogen and elemental sulfur, which belongs to the technical field of hydrogen production and gas purification. The invention is characterized in that: hydrogen sulfide or gas containing hydrogen sulfide is subjected to ionization through blockage of discharge by using a medium so as to form uniformly distributednon-equilibrium plasma, and hydrogen sulfide spontaneously decomposes into hydrogen and elemental sulfur in the plasma; when there is a photocatalyst in the plasma, energy in the photons of the photocatalyst can be utilized to promote decomposition of hydrogen sulfide, and complete conversion can be realized under proper conditions. All the frequently used solid photocatalysts can be used in the above mentioned process, e.g., titanium oxide, cerium oxide, zirconia, zinc oxide, cadmium oxide, copper oxide, molybdena, tungsten oxide, zinc sulfide, cadmium sulfide, copper sulfide, molybdenum sulfide, tungsten sulfide and a mixture composed of two or more selected from the above-mentioned photocatalysts; the photocatalysts can also be loaded on a porous material to prepare load type catalysts. The method provided in the invention is especially applicable to treatment of gas containing hydrogen sulfide in the industries of natural gas, petroleum and coal chemistry and is also applicable topreparation of hydrogen and elemental sulfur through dissociation of gas containing hydrogen sulfide in the fields of metallurgy, sea and the like. The method has no special requirements for or restriction on the source and composition of gas; thus, the method has universality to preparation of hydrogen through decomposition of hydrogen sulfide.

The present invention relates to petrochemistry, gas chemistry, coal chemistry, particularly the invention relates to a catalyst for synthesis of hydrocarbons from CO and H2 and a preparation method thereof. The catalyst is pelletized and comprises at least Raney cobalt as active component in an amount of 1-40% by weight based on the total weight of the catalyst, metallic aluminium in an amount of 25-94% by weight based on the total weight of the catalyst and a binder in an amount of 5-30% by weight based on the total weight of the catalyst. The present invention provides the catalyst stability to overheating and high productivity of hydrocarbons C5-C100 for synthesis of hydrocarbons from CO and H2.

The invention provides a solvent lignin-modified epoxy resin curing agent and a preparation method thereof. The epoxy resin curing agent is prepared from the following raw materials in part by weight: 10 to 30 parts of solvent lignin or derivative of the solvent lignin, 30 to 60 parts of phenol, 15 to 35 part of aldehyde, 20 to 45 part of ammine and 0.05 to 0.2 part of sulfuric acid catalyst. Thephenol-aldehyde-ammine epoxy resin curing agent is prepared by the Mannickreaction of the solvent lignin or derivative of the solvent lignin and the phenol, aldehyde and ammine. When the solvent lignin-modified phenol-aldehyde-ammine epoxy resin curing agent provided by the invention is used, petrochemical and coal chemical products can be replaced, the consumption of the petrochemical and coal chemical products is reduced, the cost of the epoxy resin is reduced, the lignin renewable resource in the waste from biorefinery is fully utilized, and the development of low-carbon economy is promoted.

The present invention relates to petrochemistry, gas chemistry, coal chemistry, particularly to a synthesis of hydrocarbons C5 and higher from CO and H2 under the Fischer- Tropsch reaction; the invention relates to a process and a system for producing synthetic liquid hydrocarbons. A process for producing synthetic liquid hydrocarbons is provided by catalytic converting syngas under the Fischer-Tropsch reaction on a fixed catalyst bed in a vertical shell and tube reactor with coolant supply into shell wherein as soon as the syngas conversion degree achieves 60-80%, a pressure gradient along the tubes is reduced below 0.1 bar / m and this value is maintained during the whole process. A reactor for Fischer-Tropsch synthesis is provided comprising tubes with catalyst in a shell, the ratio of the tube diameter at the tube outlet to the diameter at the inlet is from 1.5 / 1 to 2.5 / 1. The invention gives a possibility to achieve the optimum temperature range in the catalyst bed; and it improves heat and mass-transfer and shut out an accumulation of the liquid products in the bottom of the tubes.