Abstract:
The present invention provides a method for producing a silica composite by the steps of: preparing a raw material mixture containing silica and zeolite; drying the raw material mixture to obtain a dried product; and calcining the dried product, wherein the method comprising the step of allowing the raw material mixture to contain phosphoric acid and/or phosphate or bringing a solution of phosphoric acid and/or phosphate into contact with the zeolite and/or the dried product, or a combination thereof to thereby adjust a phosphorus content in the silica composite to 0.01 to 1.0% by mass based on the total mass of the silica composite.
Title translation:KATALYSATOR UND VERFAHREN ZUR AROMATISIERUNG VON C3-C4-GASEN,LEICHTER KOHLENWASSERSTOFFFRAKTIONEN UND ALIPHATISCHEN ALKOHOLEN SOWIE MISCHUNGEN DAVON
Abstract:
The invention relates to hydrocarbon feedstock processing technology, in particular, to catalysts and technology for aromatization of C 3 -C 4 hydrocarbon gases, light low-octane hydrocarbon fractions and oxygen-containing compounds (C 1 -C 3 aliphatic alcohols), as well as mixtures thereof resulting in producing an aromatic hydrocarbon concentrate (AHCC). The catalyst comprises a mechanical mixture of 2 zeolites, one of which is characterized by the silica/alumina ratio SiO 2 /Al 2 O 3 =20, pre-treated with an aqueous alkali solution and modified with oxides of rare-earth elements used in the amount from 0.5 to 2.0 wt% based on the weight of the first zeolite. The second zeolite is characterized by the silica/alumina ratio SiO 2 /Al 2 O 3 =82, comprises sodium oxide residual amounts of 0.04 wt% based on the weight of the second zeolite, and is modified with magnesium oxide in the amount from 0.5 to 5.0 wt% based on the weight of the second zeolite. Furthermore, the zeolites are used in the weight ratio from 1.7:1 to 2.8:1, wherein a binder comprises at least silicon oxide and is used in the amount from 20 to 25 wt% based on the weight of the catalyst. The process is carried out using the proposed catalyst in an isothermal reactor without recirculation of gases from a separation stage, by contacting a fixed catalyst bed with a gaseous feedstock, which was evaporated and heated in a preheater. The technical result consists in achieving a higher aromatic hydrocarbon yield while ensuring almost complete conversion of the HC feedstock and oxygenates, an increased selectivity with respect to forming xylols as part of an AHCC, while simultaneously simplifying the technological setup of the process by virtue of using a reduced (inter alia, atmospheric) pressure.
Abstract translation:本发明涉及烃原料加工技术,特别涉及C 3 -C 4烃气体,轻质低辛烷烃馏分和含氧化合物(C 1 -C 3脂族醇)的芳构化的催化剂和技术 作为它们的混合物导致生产芳族烃浓缩物(AHCC)。 所述催化剂包含2种沸石的机械混合物,其中一种沸石的特征在于二氧化硅/氧化铝比例SiO 2 / Al 2 O 3 = 20,用碱性水溶液预处理并且用稀土元素氧化物 基于第一沸石的重量为0.5至2.0重量%的量。 第二种沸石的特征在于二氧化硅/氧化铝之比SiO 2 / Al 2 O 3 = 82,基于第二种沸石的重量包含0.04重量%的氧化钠残余量,并且用量为0.5 基于第二沸石的重量计为5.0重量%。 此外,沸石以1.7:1至2.8:1的重量比使用,其中粘合剂至少包含氧化硅,并且基于催化剂的重量以20至25重量%的量使用。 该方法使用所提出的催化剂在恒温反应器中进行,而不使来自分离阶段的气体再循环,通过使固定催化剂床与气态原料接触,将其在预热器中蒸发并加热。 技术结果在于在保证HC原料和含氧化合物几乎完全转化的同时获得较高的芳烃产率,相对于作为AHCC的一部分形成二甲苯的选择性增加,同时通过使用而简化了该方法的技术设置 降低(尤其是大气压力)。
Abstract:
Apparatuses and processes for converting an oxygenate feedstock, such as methanol and dimethyl ether, in a fluidized bed containing a catalyst to hydrocarbons, such as gasoline boiling components, olefins and aromatics are provided herein.
Abstract:
Apparatuses and processes for converting an oxygenate feedstock, such as methanol and dimethyl ether, in a fluidized bed containing a catalyst to hydrocarbons, such as gasoline boiling components, olefins and aromatics are provided herein.
Abstract:
The present disclosure relates to a process for the preparation of isomers of xylene. The process includes method step of contacting an activated alkylation catalyst composite with toluene and methanol in the presence of an inert gas, at a temperature of 300 to 500° C. to obtain isomers of xylene. The alkylation catalyst composite used in accordance with the present disclosure comprises a molecular sieve loaded with at least one metal ion. The metal loaded on the molecular sieve is at least one alkali earth metal selected from the group consisting of barium, strontium, magnesium and calcium.
Abstract:
Process for the alkylation of aromatic hydrocarbons by means of aliphatic alcohols containing from 1 to 8 carbon atoms, which comprises feeding the hydrocarbon and alcohol to the head of a fixed-bed reactor, operating with “trickle flow” regime, containing at least one layer of a catalyst comprising a zeolite selected from medium-pore zeolites and large-pore zeolites.
Abstract:
In the preparation of low molecular weight olefins, especially of ethylene and propylene, a reactant stream (O) comprising at least one oxygenate and a reactant stream (C) comprising at least one C 4+ olefin are converted simultaneously in at least one identical reactor over an identical catalyst to a product mixture (P) comprising low molecular weight olefins and gasoline hydrocarbons. In this case, the ratio (V) of oxygenates in the reactant stream (O) to C 4+ olefins in the reactant stream (C) is 0.05 to 0.5 and is calculated by the following formula: formula (I) where: k oxygenate-j : carbon number of the oxygenate j n oxygenate-j : molar flow rate of the oxygenate j k olefin-i : carbon number of the olefin i n olefin-i : molar flow rate of the olefin i.