49results about How to "Flexible product plan" patented technology

The invention relates to a technological method for preparing oil products by the Fischer-Tropsch synthesis. In the technological method, a FT synthesis process comprises a first-stage FT synthesis process and a second-stage FT synthesis process; in particular, the technological method comprises the following steps: (1) synthesis gases are subjected to FT synthesis reaction in a first-stage synthesis reactor; (2) a part of tail gases from the first-stage synthesis reactor are circularly returned to an entrance of the first-stage synthesis reactor, and another part of the tail gases enter a second-stage synthesis reactor for the further FT synthesis reaction; (3) a part of tail gases from the second-stage synthesis reactor are circularly returned to an entrance of the second-stage synthesis reactor, and another part of the tail gases are used for reclaiming low-carbon hydrocarbons and hydrogen gases and then are used as fuel gases; and (4) by utilizing the recovered hydrogen gases, thehydrocarbon products in the first-stage synthesis reactor and the second-stage synthesis reactor and the hydrocarbon products which are obtained by separating and recovering the tail gases are subjected to hydrogenation and purification and then are fractionated to generate various oil products. Compared with prior art, the technological method has the characteristics of economy, flexibility, lowcost and the like.

The invention discloses a process of wet comprehensive utilization of dolomite, more specifically relates to a process for wet treatment of the dolomite to produce calcium and magnesium products, namely, the dolomite or incinerated dolomite powder is directly leached with sulfate acid to separate the calcium and the magnesium in the dolomite. The calcium precipitates in the form of calcium sulfateand the magnesium enters a solution in the form of magnesium sulfate; then magnesium hydroxide and calcium sulfate products are prepared from the magnesium solution after metathetical reaction and neutralization reaction. The intermediate product, calcium chloride, of the invention can be recycled, so the process is basically free of three-waste discharge and has notable environmental benefit; the invention, besides, significantly lowers the resource consumption and has obvious economic benefit.

The invention relates to an oxidation-reduction multi-purpose device for sulfur recovery, which is applicable to desulfurization and purifying of sulfur-bearing gas produced during the production processes of oil refining, chemical engineering, coal chemical industry, thermal power plants, etc. The oxidation-reduction multi-purpose device for sulfur recovery comprises a burning oxidation unit, a desulfurization and purifying unit, a hydrogenation reduction unit and a Claus sulfur recovery unit. The invention gets rid of a demanding oxygen-limited burning section positioned in the front part in traditional Claus reaction, which is improved into peroxide burning, and does not pursue sulfur conversion rate of the Claus reaction excessively, and only needs to control the SO2 conversion rate of sulfide in the peroxide burning and the circulating load of desulfurizer in the desulfurization and purifying reaction and the deficiency-degree regenerated thereby, can achieve or exceed recovery percent and SO2 emission of lower concentration than the Claus sulfur recovery device, with adjustable concentration of emission. The oxidation-reduction multi-purpose device of the invention can produce H2S by the hydrogenation reduction unit, thus having no requirement for the concentration of H2S in the sulfur-bearing gas, flexible operation and good comprehensive processing capacity.

The invention discloses a comprehensive utilization process for magnesium sulfate. The process specifically comprises the following steps of: reacting magnesium sulfate solution with lime milk under certain conditions to generate magnesium hydroxide and calcium sulfate mixture precipitate; growing magnesium hydroxide grains by controlling reactive crystallization conditions; adjusting pH value ofmixture suspension, and adding an inhibitor and a collector to perform flotation separation; and filtering and drying the magnesium hydroxide suspension and calcium sulfate suspension which are subjected to the flotation separation to obtain a magnesium hydroxide product and a calcium sulfate product respectively. The process has the advantages of environmental friendliness, simple process, shortflow, low production cost, complete calcium-magnesium separation, high product purity, wide application range, flexible and adjustable product scheme and the like.

The invention relates to a method of producing low-sulfur low freezing point diesel by full-range shale oil, relates to a production method of low-sulfur low freezing point diesel and solves the technical problems that the existing method of producing diesel by shale oil is complex in process and high in investment and operational cost. A material pre-fractionation unit, a reaction unit and a fraction unit are adopted in the method. The method has the advantages that finished diesel yield is high during processing of the full-range shale oil; the quality of the low-sulfur low freezing point diesel meets the national standard IV; a product scheme is flexible, the production of refined diesel and the production of the low-sulfur low freezing point diesel are both considered, and product distribution is adjusted; during the processing of the full-range shale oil, the material pre-fractionation unit is additionally provided with an absorbing column and a flash tank, lightweight shale oil is used as absorbent, LPG components in noncondensable gas can be recycled, applying a product stabilization column to the product fractionation unit to separate LPG and naphtha is avoided, and cost reduction and efficiency increasing are achieved. The invention belongs to the field of diesel production.

The invention relates to the field of oil refining and discloses a method for producing middle distillate oil from Fischer-Tropsch synthetic oil. The method comprises the following steps: introducing the Fischer-Tropsch synthetic oil and a hydrogen-containing stream into a hydrofining reactor for reaction; sequentially separating and fractionating hydrofining reaction effluents to obtain a first naphtha fraction, a light diesel oil fraction and a heavy oil fraction; introducing the heavy oil fraction into a heterogeneous hydrocracking reactor for reaction; then sequentially separating and fractionating heterogeneous hydrocracking reaction effluents, wherein at least two reaction regions are arranged in the heterogeneous hydrocracking reactor; cracking activities of heterogeneous hydrocracking catalysts per unit volume in two adjacent reaction regions are sequentially reduced in a flow direction of the reaction stream. With adoption of the method provided by the invention, the selectivity and yield of the middle distillate oil can be improved when the middle distillate oil is produced through hydrogenation and quality increasing of the Fischer-Tropsch synthetic oil.

The invention discloses a method for transformation and nitric acid reuse of a nickel nitrate / cobalt nitrate solution system. The nickel nitrate / cobalt nitrate solution system can be transformed into a sulfate and chlorate system at the low temperature; the requirements for producing various products such as nickel sulfate / cobalt sulfate, nickel chloride / cobalt chloride, and electrodeposited nickel / electrodeposited cobalt can be met; nitric acid regeneration and reuse and water cyclic utilization are achieved while system transformation is achieved; in the whole process, no impurity is introduced, and no waste water or waste residue is generated; clean and pollution-free effects are achieved; the method is easy to implement compared with a traditional extraction process; the investment is small, energy saving and environmental friendliness are achieved, and the operation cost is low; the method can be applied to production of various salts or metals; the product scheme is flexible, different market requirements can be met, and the method conforms to the environment-friendly development concept; and the method is a novel efficient and clean metallurgy technology and has good economic benefits and resource environment benefits.

The invention discloses a method for hydrogenation treatment of Fischer-Tropsch synthetic oil. Specifically, the method of the invention is to process the crude naphtha fraction, gas oil fraction, rough rock The method of hydrotreating the mixed distillate of naphtha and gas oil, or the whole distillate oil of Fischer-Tropsch synthesis. The method comprises the steps of passing the Fischer-Tropsch synthetic oil raw material through at least two hydrotreating catalyst beds with different activities for hydrotreating, and then hydrocracking the tail oil obtained after hydrotreating, so that the hydrotreating product and Hydrocracking products enter different fractionation systems for separation. The method of the invention can obtain high-quality clean diesel oil with a cetane number higher than 75, and ultra-low-condensation clean diesel oil with a freezing point lower than -50 DEG C. Meanwhile, the obtained naphtha is a high-quality steam cracking raw material for ethylene production.

The invention relates to the field of oil refining and discloses a hydrogenation quality improving method of Fischer-Tropsch synthetic oil. The method comprises the steps as follows: Fischer-Tropsch synthetic oil and a hydrogen-containing substance flow are introduced into a hydrorefining reactor to react, then a hydrorefinng reaction effluent is separated, and a heavy oil fraction is obtained; the heavy oil fraction is introduced into an isometic hydrocracking reactor to react, an isometric hydrocracking reaction effluent is separated, and a tail oil fraction is obtained, wherein at least two catalyst bed layers are contained in the isometic hydrocracking reactor, and at least part of tail oil fraction is circulated back between the catalyst bed layers of the isometic hydrocracking reactor. With the adoption of the hydrogenation quality improving method of Fischer-Tropsch synthetic oil, the selectivity of intermediate fraction oil can be improved, and higher diesel oil yield can be obtained.