38 results about "Partial decomposition" patented technology

The invention relates to a device for depositing especially crystalline layers on at least one especially crystalline substrate in a process chamber comprising a top and a vertically opposing heated bottom for receiving the substrates. A gas-admittance body forming vertically superimposed gas-admittance regions is used to separately introduce at least one first and one second gaseous starting material, said starting materials flowing through the process chamber with a carrier gas in the horizontal direction. The gas flow homogenises in an admittance region directly adjacent to the gas-admittance body, and the starting materials are at least partially decomposed, forming decomposition products which are deposited on the substrates in a growth region adjacent to the admittance region, under continuous depletion of the gas flow. An additional gas-admittance region of the gas-admittance body is essential for one of the two starting materials, in order to reduce the horizontal extension of the admittance region.

The present invention is related to a hydrocarbon oxidation process. The process comprises bringing one or more hydrocarbons into contact with a source of oxygen in the presence of a radical initiator and a catalyst. The catalyst comprises an organic metal complex located on a catalyst support, and is obtained by partial decomposition of the organic metal complex. For example, the process can be used to produce dimethyl carbonate from dimethoxy methane. The invention is also related to a partially decomposed catalyst that comprises a silica support and an organic metal complex, wherein at least 5% of the organic compound remains in the catalyst. The organic metal complex comprises an organic compound and a metal-based compound wherein the metal is selected from copper, nickel, and combinations thereof. The invention is also related to a process for manufacturing of a catalyst comprising mixing L-arginine, a Cu-based compound, water, and optionally another metal-based compound to form a solution; impregnating the solution onto a silica support to form a catalyst precursor; and partially decomposing the L-arginine to form the catalyst so that at least 5% of L-arginine remains in the catalyst.

Production of gasolines with low sulfur contents from a starting gasoline containing sulfur-containing compounds comprising a stage a) for selective hydrogenation of non-aromatic polyunsaturated compounds present in the starting gasoline, a stage b) for increasing the molecular weight of the light sulfur-containing products that are initially present in the gasoline that enters this stage, a stage c) for alkylation of at least a portion of the sulfur-containing compounds present in the product that originates from stage b), a stage d) for fractionation of the gasoline that originates from stage c) into at least two fractions, one fraction virtually lacking in sulfur-containing compounds, whereby the other contains a larger proportion of sulfur-containing compounds (heavy gasoline), a stage e) for catalytic treatment of the heavy gasoline for transformation of sulfur-containing compounds under conditions for the at least partial decomposition of hydrogenation of these sulfur-containing compounds.

A process for the combined production of ammonia and urea of the type comprising an ammonia synthesis reactor (2), a urea synthesis reactor (5) and a urea recovery section (21) stands out for the fact of submitting at least a part of a flow comprising carbamate in aqueous solution coming from the urea recovery section (21) to a partial decomposition treatment, to obtain a flow comprising ammonia and carbon dioxide in vapor phase and a flow comprising diluted carbamate in aqueous solution, which is fed together with a gas flow comprising hydrogen, nitrogen and carbon dioxide, preferably obtained by hydrocarbons steam reforming, and a flow comprising ammonia coming from the ammonia synthesis reactor (2) to a carbamate synthesis section (3), where ammonia and carbon dioxide are caused to react, to obtain a flow comprising carbamate in aqueous solution and a gas flow comprising hydrogen and nitrogen. The flow comprising carbamate in aqueous solution is then sent to the urea synthesis reactor (5), while the gas flow comprising hydrogen and nitrogen is sent to the ammonia synthesis reactor (2).

The invention relates to a process for preparing synthetic calcium fluoride (CaF2) (min 90 wt% CaF2) from fluosilicic acid. Said process includes the following steps: (a) reacting fluosilicic acid (H2SiFe) with ammonium hydroxide or ammonia in a first reactor (1) so as to obtain a first thick suspension, filtering said first suspension so as to obtain a filtrate containing an ammonium fluoride solution, (b) precipitating the ammonium fluoride solution, obtained in the form of a filtrate in step (a), with calcium carbonate in dry form or in the form of a suspension having a concentration of between 10 and 80 wt%, in a second reactor (3) so as to produce a second suspension containing the calcium fluoride and the ammonium carbonate, filtering said second suspension so as to obtain a filter cake containing calcium fluoride, and a filtrate containing an ammonia carbonate solution, washing and drying said filter cake so as to obtain calcium fluoride and a washing filter cake containing an ammonium hydroxide solution, wherein a portion of the second suspension, of from 10 to 70 wt%, is recycled to the second reactor (3) so as to enhance the crystallization of the calcium fluoride, changein most of the ammonia from the second reactor in step (b) due to partial decomposition of the ammonium carbonate under reactor conditions, then washing and sending said ammonia back into the first reactor, and collecting and treating, by means of distillation and condensation, the ammonium carbonate solutions obtained as filtrate and washing filter cake in step (b), so as to recover the liquid ammonia which is recycled to the first reactor (1).

The invention discloses a synthesis method of (2S, 3S, 4S)-5-(3, 4-diamino-thiophane-2-group) valeric acid, while prior method has long reaction and partial decomposition of product in reaction caused by concentrated halogen acid, to affect the quality of d-biotin. The invention processes reflux reaction on diethyl malonate condensate, cyano compound or bis-benzyl biotin in halogen acid, adds glacial acetic acid later, refluxes until no single-benzyl biotin and d-biotin exist in product, concentrates to remove unreacted halogen acid and glacial acetic acid, adds absolute ethyl alcohol, freezes to 0-5DEG C, adds lithium hydrate to neutralize and precipitate white solid crystals, filters, poaches filter cake via absolute ethyl alcohol, and dries to obtain target product. The invention has short reaction and controllable reaction end, which leads glacial acetic acid in later reaction to effectively avoid diamino acid being decomposed in concentrated halogen acid, to improve product yieldand content.

The present invention relates to a method for preparing a substrate (1) with the purpose of detaching a layer, called the detachment layer, from said substrate by irradiation of the substrate with a light flux (F) for heating a buried region of the substrate and bringing about decomposition of the material of that region to detach said detachment layer, characterized by the fact that it comprises the steps consisting of: a) fabricating an intermediate substrate including a first layer (2) called the buried layer, and a second layer (4) called the covering layer, wherein the second layer (4) covers all or part of the first layer (2), the covering layer (4) is substantially transparent to said light flux (F), and the buried layer (2) which is formed by implantation of particles into the substrate can absorb said flux (F) for its part, and b) selectively and adiabatically irradiating a region called the treated region of the buried layer (2) until at least partial decomposition of the material constituting it ensues.

The invention discloses a boiler performance index analysis method based on partial incremental factor decomposition, which includes the following steps: (1) determining the small operation index that affects the boiler thermal efficiency according to the reverse equilibrium thermal efficiency calculation method. (2) Use the analytical theory of full increment and partial increment of functions in mathematical analysis, and use the method of factor decomposition to deduce the degree of influence of each factor on the full increment. (3) Establish a calculation model of boiler performance index inverse balance and partial increment, and use this model to analyze the influence degree of each small operating index on the boiler performance index. The method of the present invention is simple and easy to implement, easy to program, can know the process parameters when the boiler deviates from the optimal working condition in real time, quantitatively understand and grasp the influence direction and degree of influence of the change of each small index on the boiler performance index, and help the operating personnel to target the target It can deal with the weak link of boiler operation accurately, so that the boiler can always operate in the best condition.