sublimation of phthalic acid anhydride
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Phthalic acid - Wikipedia
Phthalic acid is an aromatic dicarboxylic acid, with formula C 6 H 4 (CO 2 H) 2. It is an isomer of isophthalic acid and terephthalic acid. Although phthalic acid is of modest commercial importance, the closely related derivative phthalic anhydride is a commodity chemical produced on a large scale.
Phthalic anhydride - Wikipedia
Phthalic anhydride is the organic compound with the formula C 6 H 4 (CO) 2 O. It is the anhydride of phthalic acid. Phthalic anhydride is a principal commercial form of phthalic acid. It was the first anhydride of a dicarboxylic acid to be used commercially.
Production of phthalic anhydride from xylene
Jun 01, 2014· 100 | P a g e 2. Distillation column (T-701) I. INTRODUCTION This report represents detailed calculations of design and sizing for the distillation column (T- 701) of the production of phthalic anhydride from xylene process. Preliminary calculations are done to be used later such as mass balance, density and molecular weight.
Alfa Aesar Phthalic anhydride, 99% | Fisher Scientific
Phthalic anhydride is used in the preparation of primary amines. It is used as a precursor to prepare anthraquinone, phthalein, rhodamine, phthalocyanine, fluorescein and xanthene dyes. It serves as an important intermediate in the plastics industry, dyes, resins and pigments.
Purification of phthalic anhydride - Free Patents Online
13. A process for the separation of phthalic anhydride from impurities which comprises heating impure catalytic phthalic anhydride with sulfuric acid and subsequentlyrecovering phthalic anhydride from the mixture by vaporization, removal and fractional condensation of the vapor, and the separate recovery of the fractionated condensate. 14.
Product Stewardship Summary Phthalic Anhydride
Product Stewardship Summary Phthalic Anhydride . Introduction: As Thirumalai Chemicals Limited, we have . Phthalic anhydride is recovered by de-sublimation into switch condensers units. Purification is based on heat treatment and . Phthalic anhydride present to Phthalic acid, treated as effluent.
Source Assessment: Phthalic Anhydride (Air Emissions)
Phthalic anhydride (99.99%) is taken overhead, condensed, and sent to the product storage tank (unit T) where it is stored at atmospheric pressure and 149°C. The phthalic anhydride in the storage tanks can be pumped to tank cars for shipment as a liquid, or it can be sent to a …
US2134531A - Purification of maleic anhydride - Google Patents
As a result there is produced an impure solution of maleic acid containing phthalic acid :and/or quinones, and other impurities, and when the maleic acid is converted to maleic anhydride the resulting maleic anhydride contains many of the impurities present in the'crude maleic acid.- . The purification of maleic anhydride in accordance with .
Phthalic Anhydride - The Chemical Company
TCC's phthalic anhydride is a toxic, white crystalline compound used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. Phthalic anhydride is the anhydride of phthalic acid. This colorless solid is an important industrial chemical, especially for the large–scale production of plasticizers for plastics.
O-Phthalimide CAS#: 85-41-6 - ChemicalBook
DIETHYL 2-PHTHALIMIDOMALONATE-2-13C N-PHTHALOYL-DL-GLUTAMIC ANHYDRIDE PYROMELLITIC DIIMIDE 4-Nitrophthalimide N-Hydroxyphthalimide PHTHALAMIDE Phthalic acid N-(2-Ethylhexyl)-5-norbornene-2,3-dicarboximide Maleimide Succinimide Dibutyl phthalate N-Hydroxysuccinimide Potassium phthalimide O-Phthalimide DIALIFOS Phthalhydrazide N,N'-1,3 …
Phthalic anhydride - Sciencemadness Wiki
Dry the wet phthalic acid by placing it in a beaker (unless it already is) and heat it until it dries. Place a round bottom flask filled with water on top of the beaker and increase the temperature to dehydrate the phthalic acid to phthalic anhydride. The phthalic anhydride will sublime and condense on the bottom of the flask and on the beaker .
Alfa Aesar Phthalic anhydride, ACS, 99.0-100.2% | Fisher .
GHS H Statement H334-H318-H302-H335-H315-H317 May cause allergy or asthma symptoms or breathing difficulties if inhaled. Causes serious eye damage.
Heat transfer in the desublimation of phthalic anhydride .
The heat transfer in the desublimation of phthalic anhydride has been investigated experimentally for the purpose of modelling and developing the design calculation procedure. Experiments were performed on a pilot installation connected to the industrial plant.
Phthalic anhydride Datasheet - chemeo
Cheméo (semeo) is the biggest free database of chemical and physical data for the process industry.
PRODUCTION OF PHTHALIC ANHYDRIDE FROM PHTHALIC ACID …
Mar 13, 1973· Melt of phthalic anhydride containing a small amount of azeotroping agent is maintained at a temperature of from 160° to 200°C. Phthalic acid is introduced into the melt, and an azeotropic mixture of water and azeotroping agent is withdrawn therefrom.
Phthalic anhydride CAS#: 85-44-9 - ChemicalBook
Description: Phthalic anhydride is the organic compound with the formula C 6 H 4 (CO) 2 O. It is the anhydride of phthalic acid. This colourless solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics.
Phthalic anhydride - Infogalactic: the planetary knowledge .
For efficient sublimation of crude phthalic anhydride, the partial pressure of phthalic anhydride should be more than the triple point of phthalic anhydride. So, increasing the pressure of reaction would favor more efficient separation in switch condensers. Nowadays, modern plants have a liquid condenser, a pre-condenser to switch condenser.
Product Name Phthalic anhydride | Sigma-Aldrich
Search results for Phthalic anhydride at Sigma-Aldrich. Compare Products: Select up to 4 products. *Please select more than one item to compare
Anhydride | Definition of Anhydride at Dictionary
Anhydride definition, a compound formed by removing water from a more complex compound: an oxide of a nonmetal (acid anhydride) or a metal (basic anhydride) that forms an acid or a base, respectively, when united with water. See more.
Phthalic acid | H2C8H4O4 - PubChem
Phthalic acid is an aromatic dicarboxylic acid, with formula C6H4(COOH)2. Phthalic acid is used mainly in the form of the anhydride to produce other chemicals such as dyes, perfumes, saccharin, phthalates and many other useful products. Phthalic acid, when found in tissues or biofluids arises from exposure to these phthalate products.
Phthalic anhydride; CASRN 85-44-9
Phthalic anhydride; CASRN 85-44-9. Human health assessment information on a chemical substance is included in the IRIS database only after a comprehensive review of toxicity data, as outlined in the . IRIS assessment development process. Sections I (Health Hazard Assessments for …
Phthalic anhydride - NIST
Phthalic anhydride is a white (lustrous needles) solid that is slightly soluble in water. (6,8) Phthalic anhydride has an odor threshold of 0.053 parts per million (ppm). (7) The chemical formula for phthalic anhydride is CH O, and it has a molecular weight of 148.12 g/mol.
Phthalic anhydride - NIST
In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:
Production of Maleic Anhydride - Chemical Engineering
Production of Maleic Anhydride Background Maleic anhydride is a versatile chemical intermediate used to make unsaturated polyester resins, lube oil additives, alkyd resins, and a variety of other products. In 1995, global production of maleic anhydride was estimated at 1.8 billion pounds, with an estimated value of $700 million.
Engineering And Cost Study Of Air Pollution Control For .
Flow path cross sectional area within the box is larger than in outlet piping. Vaporized phthalic anhydride is condensed and collected in the sublimation box and non-condensibles are vented to the atmosphere (110° F). Phthalic anhydride is periodically removed manually and recycled to the process.
US2105911A - Purification of phthalic anhydride - Google .
' 14. A process for the purification of phthalic anhydride which, comprises heating impure catalytic phthalic anhydride with sulfuric acid until evolution of sulfur dioxide substantially ceases, and recovering phthalic anhydride from the resulting mixture by vaporization, removal and condensation of the vapor, and collection of the condensate. 15.
What do you call the product of phtalic ahydride and .
Jan 20, 2008· Phenylacetic Acid Phenylacetylene Phenylhydrazine Phthalimide Quinoline Quinone Sodium p-Toluenesulfinate 1,3,5-Trinitrobenzene 2, 4, 6-Trinitrobenzoic Acid Index Phthalimide hthalimide 1. Procedure IN a 5-l. round-bottom flask (Pyrex) is placed a mixture of 500 g. of phthalic anhydride and 400 g. of 28 per cent ammonium hydroxide.
Synthesis and Verification of Biobased Terephthalic Acid .
Feb 04, 2015· Dehydration of the exo-DA adduct to phthalic anhydride. The oxabicyclo moiety in the exo-DA adduct is readily dehydrated with an acid.We attempted to dehydrate the exo-DA adduct using sulfonic acid, phosphoric acid, and P 2 O 5, but the yield and purity of the phthalic anhydride produced were not high enough to isolate it.However, a more effective protocol for the dehydration of the exo …