Method of periodically heating a product separator of a plant for producing phthalic anhydride or maleic anhydride

US4592412A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Volker Franz · Frankfurt am Main, DE
• Rolf Geissen · Frankfurt am Main, DE

Key dates

• Filing date: Mar 14, 1985
• Grant date: Jun 3, 1986
• Expiry date: Mar 14, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C51/573
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

In a method of periodically heating a product separator of a plant for producing anhydride or maleic anhydride, a PA or MA product is deposited on cooling surfaces of the product separator. To melt the product, the cooling surfaces are indirectly heated by means of a heated liquid, which is circulated through the product separator. The liquid heat transfer medium is indirectly heated with steam in a heater for the heat transfer medium. At least during the time of the largest steam demand, most of that steam is taken from a steam accumulator, which is charged with steam supplied from the plant for producing PA or MA. The charging of the steam accumulator is effected to at least a substantial degree during the time in which the heater for the heat transfer medium is out of operation or is operated under a low load.