p-Hydroxybenzoic acid

Application

P-Hydroxybenzoic acid (pHBA) is a versatile intermediate in the manufacture of bacteriostatic agents specially for parabenes (alkyl esters of p-Hydroxy benzoic acid) which are used in food and personal care products as a preservative. p-Hydroxybenzoic acid is applied in the production of liquid crystal polymers.  It is also used as an intermediate of dyes, pharmaceuticals, insecticides, pesticides, plasticizers and many other chemical compounds.

Benefits

This cost efficient and technically optimized production process can be operated in the state of the art plant equipment, less than 6 years old.

Starting material for the production of p-Hydroxybenzoic acid is phenol which is carboxylated under low pressure using KOH as base.

The reaction product is precipitated, isolated and subsequently washed, dried and stored in a silo prior to packing.

1. Carboxylation of Phenol
   1. Pre-reaction
   2. Carboxylation
2. Working Up a Reaction Mixture
   1. Dissolving in water
   2. Acidfication
   3. Salt separation
   4. Purification
   5. Precipitation of product
3. Isolation of Product
4. Drying and Packing

Click on the Below Links to View the Process Flow Diagrams:

Process Flow Diagram-Reaction

Process Flow Diagram-Isolation

Sale includes metering and storage tanks, reactor, autoclave as well as the equipment for product isolation, drying and bagging

Process equipment can be used for the production of o-Hyroxybenzoic (salicylic acid) acid as well.