Abstract:
For preparing at least one boric oxide in an anhydrous or hydrated form and of general formula B.sub.2 O.sub.3, xH.sub.2 O, in which x is a number from 0 to 3, a methyl borate hydrolyzate comprising boric oxide and methanol is introduced into a distillation column is introduced the product from, at least one compound (preferably a hydrocarbon such as, e.g., 2,3-dimethyl butane or 2-methyl pentane) forming a heteroazeotrope with methanol, said heteroazaeotrope having a boiling point below that of the azeotrope formed by methyl borate with methanol and at least one compound having a boiling point higher than that of methyl borate, said compound not forming an azeotrope with a boiling point below that of said heteroazeotrope and then at the head of the column said heteroazeotrope is recovered and at the bottom of the column a suspension containing at least one boric oxide.A description is also given of a process for the oxidation of at least one saturated hydrocarbon into a product incorporating the corresponding alcohol wherein oxidation is carried out with oxygen in the presence of a boric oxide with. The oxidation product is hydrolyzed into orthoboric acid and alcohol, which is recovered by separation from the organic phase. The aqueous phase containing the boric acid is fed into a methyl borate formation zone and the methyl borate is recovered in the form of its azeotrope with methanol. The recovery of the boric oxide from said azeotrope is performed in accordance with the aforementioned process, the recovered boric oxide being recycled to the oxidation stage.
Abstract:
The invention concerns an improved method for the thermal conversion of methane to hydrocarbons of higher molecular weights.The method is based on the utilization of a multichannel system of ceramic material in which the charge and heating fluids or cooling fluids pass alternately through rows of channels, constituting a continuous assembly comprising a pyrolysis zone followed by a quenching zone.
Abstract:
Process for manufacturing a benzene carboxylic acid by oxidation of an alkyl substituted benzene, and in particular for manufacturing terephthalic acid by oxidation of paraxylene, in which said benzene carboxylic acid, in solution in an aliphatic monocarboxylic acid, such as acetic acid, is oxidized by means of a gas containing molecular oxygen at a temperature T from 80.degree. to 260.degree. C. under a pressure from 2 to 30 kg/cm.sup.2, in the presence of a transition metal compound, in at least one reactor whose internal wall is maintained during the whole reaction time at a temperature, in .degree.C., from T - 10 to T + 100.
Abstract translation:通过烷基取代的苯的氧化制造苯羧酸的方法,特别是通过氧化对二甲苯制造对苯二甲酸的方法,其中在羧酸脂肪族单羧酸如乙酸中的溶液中的所述苯羧酸被氧化,由 在过渡金属化合物的存在下,在2-30kg / cm 2的压力下,在温度T为80-260℃的气体中含有分子氧的气体在至少一个反应器中,内壁保持在 整个反应时间在温度,℃,从T-10到T + 100。
Abstract:
A benzene dicarboxylic acid is purified by heating a solution thereof to 110.degree. - 350.degree. C in the presence of a hydrogenation catalyst; the solvent is a mixture of water with a secondary or tertiary alcohol.
Abstract:
This process for purifying waste-water containing ammonium sulfate comprises reacting said waste-water with calcium oxide, calcium sulfide and ammonium sulfite; roasting the resulting precipitate to regenerate calcium oxide and calcium sulfide; and reacting sulfur dioxide with hydrogen sulfide obtained in a prior step to yield sulfur.
Abstract:
Device for connecting a heat exchange pipe (4), whereby said pipe (4) is positioned between walls (11) that are located on both sides of pipe (4), intended for heating and/or cooling a reactor, whose internal pressure is considerably higher than the atmospheric pressure and than the pressure that prevails inside said pipe (4), and said reactor, whereby said device comprises a series of cooperating means that comprise: means for connecting this pipe (4) and jacket (2a) of said reactor, whereby said means comprise a packing box (21, 22, 23), a flange (28) that is attached to jacket (2a) of the reactor by means of a joint (18), a bellows (25) that is placed between packing box (21, 22, 23) and said flange (28) to ensure a relatively flexible connection between pipe (4) and jacket (2a) of the reactor. FIG. 3 to be published.
Abstract:
The invention concerns a process for the alkylation of at least one isoaffin selected from the group formed by isobutane and isopentane by at least one olefin containing 2 to 6 carbon atoms per molecule in the presence of a liquid acid catalyst, the process comprising mixing a feed comprising the olefin to be converted with an effluent comprising a major portion of isoparaffin in a first mixing zone, and forming an emulsion of said catalyst in a hydrocarbon effluent comprising a major portion of isoparaffin in an emulsifying zone, said effluent constituting the continuous phase of the emulsion thus formed, then mixing a major portion of the emulsion of acid in hydrocarbon effluent with a major portion of the diluted feed comprising the olefin in a second mixing zone, followed by carrying out the majority of the reaction in a reaction zone which is supplied by the major portion of said mixture.
Abstract:
A reaction-distillation method is provided in which a chemical reaction and fractionation are conducted in an apparatus having at least one reaction-distillation zone (A,B) including at least one bed of solid elements disposed on a fluid-permeable support (5) having perforations small enough to retain the elements. The bed of solid elements includes loose solid catalytic particles (2) and at least one receptacle (3), containing at least one distillation packing body (4). The external jacket of the at least one receptacle (3) is permeable to fluids and impermeable to the solid catalytic particles (2) and the packing body (4). The apparatus can be used for carrying out chemical reactions and concomitant fractionation of the reaction mixture, for example, to synthesize ethers from olefins and alcohols.
Abstract:
An oxidizable charge is oxidized in a gaseous phase reaction. The oxidizable charge and an oxidizing gas flow simultaneously and separately through a distribution zone made of a ceramic material. In at least a part of the distribution zone, the oxidizable charge and the oxidizing gas flow through a multiplicity of passages of a dimension so small that any flame resulting from oxidation of the oxidizable charge will be quenched. The oxidizable charge and oxidizing gas are then mixed in a mixing zone made from a ceramic material defining a multiplicity of spaces with passages having a dimension comparable to the dimension of the passages in the distribution zone. The mixture of gases then flows through a reaction zone made from a ceramic material defining another multiplicity of passages having dimensions comparable to those in the distribution zone. The distance between each of the distribution, mixing and reaction zones is also so small that any flame resulting from oxidation of the oxidizable charge will be quenched.
Abstract:
A process for thermally converting methane e.g., at 1,000.degree.-1,300.degree. C. into hydrocarbons with higher molecular weights, especially ethylene comprises circulating a gas containing methane in ceramic channels (11) grouped in rows which cover at least a part of the reactor (1) length, parallel to its axis. At the reaction temperature, the temperature variation is kept at less than 20.degree. C. The rows of channels form multiple plates (4) which are not adjacent to one another and which define tight spaces (17) in which are housed the electric heating (5, 22) means that heat the channel plates in a first zone (9) through successive, independent cross sections substantially perpendicular to the axis of the reactor and substantially parallel to the plane of the plates. Means for heating, servocontrol and modulation (7, 8) regulate the heating system. At the exit of the heating zone (9), the effluent is cooled in a second zone (10) equipped with cooling means and finally collected.