1,900 parts of the spray-dried silica xerogel prepared as described above (with approximately a 10% loss on ignition) is added to the salt solution and the slurry diluted to about 32% total solids concentration. 4. 2. The process according to the invention shows the following significant advantages over the prior art: 1. When using air as the oxygen-containing gas, the gas phase consists substantially of nitrogen, oxygen, carbon dioxide, steam and naphthalene. The. After 550 running hours 35% by weight of l,4-naphthoquinone with 45% by weight of phthalic anhydride are obtained. It is accordingly an object of the present invention to provide a process for the catalytic gas phase oxidation of naphthalene to naphthaquinone in high yield and at a high space/time yield. 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. Get article recommendations from ACS based on references in your Mendeley library. EXAMPLE 3 The process is carried out according to the general method of working described above exept that the experiment is preceded by treating the catalyst in the following way: 1.5 standard cubic meters/h of a nitrogen stream containing 1% by volume of oxygen as well as g/h of a naphthalene with a sulphur content less than 10 ppm are conducted over the catalyst located in the reaction tube during a period of 24 hours at a temperature of 400C. US. : 350,569, 1301 Foreign Application Priority Data July 12, 1972 Germany 2234306 Mar. We appreciate your patience as we continue to improve the ACS Publications platform. Despite the increased catalyst load the space/time yield is considerably increased over the prior art. In the commcrical process, liquid naphthalcnc is injected into thc fluidized bcd where prchcated air serves as the vortex gas. No. The toxicity of phthalic acid is low with LD50 (mouse) of 550 mg/kg. This will help us to improve better. Particularly preferred is the temperature range between about 350 and 410C. According to Organic Synthesis the alkaline oxidation of naphthalene with potassium manganate (VII) yields 2-(carboxycarbonyl)benzoic acid which on treatment with NaHSO3 and then HCl is converted to phthalaldehydic acid which can then be converted to phthalic acid. Find more information about Crossref citation counts. EXAMPLE The process is carried out according to Example 3, except that the naphthalene/air mixture is conducted through the reaction tube at a temperature of 410C. Preparations and reactions of mercaptoterephthalic acids and derivatives, Selective removal of 2-pentenenitrile and 2-methyl-2-butenenitrile from 3-pentenenitrile. sulphur dioxide. It's not expensive, and you'd likely spend more on oxidant if you try to make it yourself.

Solutions of solid, liquid or gaseous sulphur compounds can likewise be prepared in the liquid starting product and a corresponding branch stream can be added in metered quantities by means of a pump to the main stream of naphthalene. The yield of naphthoquinone is increased markedly compared with process effected in the presence of far more sulphur. Herein ... such as ESI‐MS, UV/Vis, and EPR analysis, X‐ray diffraction, and XAS, can be employed for the oxidation of naphthalene in the presence of acid to afford 1,4‐naphthoquinone. Pitcoal naphthalene can be used for example as an additive which has a relatively high content of sulphur compounds, for example 0.4 (calculated as elementary sulphur).

I took a look at Sigma's site. XXX.

Other agents include starches, gums, carboxylated celluloses and polymers such as polyvinyl alcohol. Moreover, the catalyst composi tion varies widely between the fine and coarse particles, which lessens the conversion of naphthalene to phthalic anhydride.



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