초록 ▼

An improved method for the wet process manufacture of concentrated phosphoric acid is disclosed herein. A mixture of gaseous sulfur trioxide and sulfuric acid now replaces concentrated sulfuric acid as a process reactant which results in a higher heat of reaction and the ability to evaporate out of

An improved method for the wet process manufacture of concentrated phosphoric acid is disclosed herein. A mixture of gaseous sulfur trioxide and sulfuric acid now replaces concentrated sulfuric acid as a process reactant which results in a higher heat of reaction and the ability to evaporate out of the reaction slurry increased inputs of water. With this method the increased inputs of water, either from undried phosphate rock, wet grinding of phosphate rock, use of dilute sulfuric acid, or from other sources will not interfere with associated high P2O5 yields, lower concentrations of filtrate phosphoric acid and/or unbalance the zero steam requirements.

대표청구항 ▼

In the wet process manufacture of phosphoric acid from phosphate rock wherein the phosphate rock is reacted with a concentrated acid reagent to yield concentrated phosphoric acid, the improvement in the process comprising the step of: reacting the phosphate rock with an effective amount of acid reag

In the wet process manufacture of phosphoric acid from phosphate rock wherein the phosphate rock is reacted with a concentrated acid reagent to yield concentrated phosphoric acid, the improvement in the process comprising the step of: reacting the phosphate rock with an effective amount of acid reagent for yielding phosphoric acid wherein said reagent is comprised of a mixture of sulfuric acid and gaseous sulfur trioxide, the gaseous sulfur trioxide being added in an effective amount so as to cause the evaporation of excess water in the feed streams by the release of heat from the reaction between the sulfur trioxide gas and the rock.