oxidation of naphthalene to phthalic acid

The process according to the invention shows the following significant advantages over the prior art: 1. Phthalic acid is produced by the catalytic oxidation of naphthalene or ortho-xylene directly to phthalic anhydride and a subsequent hydrolysis of the anhydride. Sigma has 100g for $31.80, but I can buy 8oz of vanadium pentoxide for $23.00 and naphthalene is next to nothing if you buy it as moth balls. : 350,569, 1301 Foreign Application Priority Data July 12, 1972 Germany 2234306 Mar. Chim. Example 2 The effects of adding a olyacrylamide fiocculating a ent to a feed slurr are demonstrated in Table I, in. 4,5-dimethyltrithione), thiopyrones, thiazines, thioxynthrene and thianthrene; thiocarboxylic acids and their derivatives, such as thioacetic acid, thiobenzoeic acid, dithiobenzoeic acid and thioformamide; thiocarbonic acid derivatives, such as carbon disulphide, carbon oxysulphide and thiocyanic acid; isothiocyanic acid, dithiocyanogen, thiocyano phenyl thiocyanogen, thiocarboxylic acid ester, xanthogenic acid derivatives, thiourethanes and dithiocarbamic acid. EXAMPLE 2 The process is carried out according to the general method of working described above. Inorganic sulphur compounds can be employed, for example carbon disulphide, hydrogen sulphide and sulphur dioxide. The content to or The Washed, filter Cake then difference between the coarse and fine fractions for the calrepulped Spray'dned under Producmg cined catalyst as compared with the calcined whole cataaverage Pamela Size of abut 100 mlcrons and a 40 lyst is less than 10% with the added agent and over 25% mum of 2% fi than f f without the added agent.

Patent application Ser.

That's what I'm asking about. l ,4-naphthoquinone is a valuable starting product for the production of technically important substances. The impregnated vanadium oxide-potassium sulfatesilica catalyst is then dried and activated by heating in air at 350 to 370 C. for 2 or more hours. Then the pH of the solution is adjusted to the alkaline side by the addition of ammonia. The naphthalene is evaporated in the evaporator with a capacity of about 3,500 ml which is arranged in front of the reaction tube to an appropriate extent and admixed with the air stream. inches f.p.n1. The naphthalene used according to the process of the invention is so-called petronaphthalene (Ullmann, Encyclopedie der technischen Chemie, 13, 719 (1962). Then the agitator is K20 s03 mole ratio K20 s03 mole ratio turned off and the silica gel slurry is aged for 10 minutes N A t 7.3 10.0 1.51 11.1 16.3 1.72 at 110-115" C. and at a pH of from 8.0 to 8.5.

Phthalic anhydride is produced at temperatures from 300-450 C. using naphthalene concentrations of 1 to 3.5 mole percent in air. EXAMPLE 6 The process is carried out as in Example 4, except that instead of elementary sulphur, thionpahthene is added in an amount of 0.063% by weight based on the naphthalene used. Wednesday, November 4, 3:00AM - 12:00PM ET, The Oxidation of Naphthalene to Phthalonic Acid by Alkaline Solutions of Permanganate, Your Mendeley pairing has expired. 3,507,810 Patented Apr. The addition of a flocculating agent to the silica-salt slurry results in improved handling for high solids content slurries and a more uniform composition of the catalyst particles. In general, the process according to the invention is carried out in the same apparatuses and with the same catalysts as are known for the oxidation of naphthalene to phthalic anhydride. It is merely necessary to maintain the sulphur concentration according to the invention in the reaction space which is usually possible without the installation of additional pieces of apparatus. In general the process can be carried out in the temperature range of about 250 to 500C, for example about 300 and 500C or about 320 and 450C. 15, 1973 Germany 2312838 152] US. 12, 1973 [21] .Appl. Patent 2,783,249. SiO 8.9% Na O, containing 900 lbs. If vanadium pentoxide is the cheapest way then yeah I'll just buy phthalic anhydride. In the production of l,4-naphthoquinone along with phthalic anhydride by the catalytic gas phase oxidation of sulfur free naphthalene, the improvement which comprises maintaining in the reaction space a sulphur concentration of about 0.002 to about 0.05% by weight based on the naphthalene used. After impregnation, the gel is spray-dried under conditions which leave about 10% moisture and ammonia in the catalyst. This will help us to improve better. Nos. 1.000 ml of a catalyst are introduced into the upright reaction tube which consists of 49.9% by weight of silica, 30.0% by weight of sulphate, 13.2% by weight of potassium and 6.9% by weight of V The catalyst temperature is measured in the reaction zone by a thermocouple element which is arranged in a protection tube and whose height can be adjusted. The toxicity of phthalic acid is low with LD50 (mouse) of 550 mg/kg. In lieu of an abstract, this is the article's first page. EXAMPLE The process is carried out according to Example 4 except that instead of elementary sulphur, thiophene is added in an amount of 0.04% by weight based on the naphthalene used. Percent References Cited UNITED STATES PATENTS 2,831,841 4/1958 Jones. mama m. Flewhm Attelting Officar mu: .18. 3. 108 g/h of solid reaction product with a content of 35% by weight of 1,4- naphthoquinone and 47% by weight of phthalic anhydride are obtained. Work can be carried out at an oxygen concentration of about 6 to 30 by volume, preferably about 15 to 25 by volume, in particular about 20 to 22 by volume, in the recycle gas.

up to 6,500 hours, while the activity of the catalyst remains constant. http://www.sigmaaldrich.com/catalog/search?interface=All&term=Pthalic+anhydride&N=0&mode=match%20partialmax&focus=product&lang=en®ion=US. Two types of processes have been developed for the gas-phase oxidation:

The process of the invention is illustrated in Examples 2 to 10. 3,249,538 5/1966 Freier 25-18 3,296,235 1/ 1967 Zoebelein.

The process of claim 1 wherein said slurry contains approximately 40% solids content. 1,135,883 and 1,219,465, for example, gas phase oxidations of naphthalene are de' scribed which are carried out in the presence of special catalysts and result in l,4-naphthoquinone along with phthalic anhydride as the reaction product. Does anyone know a cheaper way of oxidizing naphthalene to phthalic anhydride than using vanadium pentoxide?

The elementary sulphur is dissolved in the previously melted naphthalene prior to this being introduced into the evaporator. These agents have previously been used as plasticizers for extrudable catalyst compositions, which are formed into spherical particles by extrusion, slicing and melt-spraying (see US.

With the aid of a salt bath the catalyst temperature is constantly kept at the temperature given in the Examples. provides a more uniform size distribution for the catalyst product. SiO- and the temgl -gg m sh) Fine ggg nresh) perature is adjusted to 105 F. The addition of sul- 25 furic acid is begun at a controlled rate so that a pH ii 803/1120 Pement SOs/K50 of 8 is reached in 12 to 15 minutes. 260/346.4, FOREIGN PATENTS OR APPLICATIONS 1,055.124 1/1967 United Kingdom 260/396 R [451 July 29,1975. Thus the difference in SO3/K2O mole ratio between Example 1 coarse and fine fractions (as separated by a 200-mesh screen) is less than 15% and preferably less than 10%. It may prove advantageous to employ such sulphur-containing hydrocarbon fractions, which consist substantially of naphthalene, in order to avoid the introduction of foreign compounds into the starting products upon adding sulphur in elementary form or in the form of sulphur compounds. Find more information on the Altmetric Attention Score and how the score is calculated. about to 70% The run with the added agent resulted in a higher salt of a gd Gamer Sald Catalyst m Its freshly prepared concentration for both the coarse and fine fractions. 30. Advantageously the sulphur content is about 0.01 to 0.02%, the sulphur being in elementary form or conbined organic or inorganic form, e.g. V2O5 on a support is also used as a catalyst. How satisfied are you with the answer?

A catalyst prepared in accordance with this procedure was used in a vapor phase fluid bed oxidation conversion of naphthalene to phthalic anhydride. 2. I. Oxidation of Thiols to Disulfides with Lead Tetraacetate1, Chemistry of cyanodithioimidocarbonic acid, Reduction of Sulfonic Acids and Related Organosulfur Compounds with Triphenylphosphine–Iodine System, Osmium and Ruthenium Tetroxide-Catalyzed Oxidations of Pyrene1, CLXXXII.—The interaction of hydrogen dioxide and sulphides, Reactions of triads Se8 KOH DMSO, Se8 KOH DMSO, Te KOH HMPA with acetylenes, Facile oxidation of sulfides to sulfoxides using iodosobenzene and benzeneseleninic acid as a catalyst, Catalytic oxidation of ethylene to mixtures of acetic acid and vinyl acetate, Organic disulfides and related substances.

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