Energy recovery method and system for combined sulphuric acid and phosphoric acid manufacturing plant

Patent · Tue Jan 22 00:00:00 EST 1985

OSTI ID:5868133

Cameron, G M; Orlando, J V

In conventional processes for manufacturing phosphoric acid, sulphuric acid is reacted with phosphate rock to produce weak phosphoric acid which is concentrated using steam from the associated sulphuric acid manufacturing operation. Low grade heat from the absorbers and drier of the sulphuric acid manufacturing plant has been wasted. According to the invention waste heat from the drier and one or more absorbers of the sulphuric acid manufacturing plant is used in all the evaporators of the phosphoric acid plant. The evaporators all operate at low pressures and their heaters are arranged in series, to enable the heat to be used at the relatively low temperatures available. The valuable steam is thus freed for other uses.

• Assignee: C-I-L Inc. (Canada)
• Patent Number(s): US 4495161
• OSTI ID: 5868133
• Resource Relation: Patent Priority Date: Priority date 16 Apr 1984, Canada; Other Information: PAT-APPL-599606
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CHEMICAL REACTORS
ENERGY EFFICIENCY
WASTE HEAT UTILIZATION
PHOSPHORIC ACID
PRODUCTION
ABSORPTION HEAT
DRYERS
EVAPORATORS
PRESSURE DEPENDENCE
STEAM
SULFURIC ACID
EFFICIENCY
ENERGY
ENTHALPY
HEAT
HYDROGEN COMPOUNDS
INORGANIC ACIDS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
WASTE PRODUCT UTILIZATION
320303* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Equipment & Processes