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8

WWW.PRAYON.COM

PRAYON

TECHNOLOGIES

PROCESSES

FIRST RANGE

Processes with the first reaction as

“dihydrate”

+

With one crystal: “Dihydrate” Prayon

Process or DPP (Mark 4)

DPP

DIHY

> Dihydrate

+

With two crystals: “Dihydrate then

Hemihydrate” Central-Prayon Process

or CPP

CCP

DIHY

>

HEMI

> Hemihydrate

+

With two crystals and only one filtra-

tion: “Dihydrate - hemihydrate filtration”

or DA-HF.

DA-HF

>

DIHY

HEMI

> Hemihydrate

For the past 30 years, Prayon’s licensing

activities have been mainly based on

the DPP - Mark 4 dihydrate process for

phosphoric acid production. Its ability

to efficiently convert various types of

phosphates, its flexibility, its ease of

operation and its low maintenance cost

make it the leading process on the market.

As calcium sulphate is sold at the Prayon

production site at Engis (Belgium), the

purity and quality of the gypsum must be

very high. To fulfil these requirements, the

process used at our unit is the two-stage

dihydrate hemihydrate CPP or CENTRAL-

Prayon Process.

This high-efficiency process (approx.

98.5% cake efficiency) can produce a

relatively strong acid (+/- 35% P

2

O

5

).

The DA-HF is the newcomer, it ensures a

high efficiency with an investment cost

close to a Dihydrate Process.

SECOND RANGE

Processes with the first reaction as

“hemihydrate”

+

With one crystal: “Hemihydrate” Prayon

Process or PH1

PH1

HEMI

> Hemihydrate

+

With two crystals: “Hemihydrate” then

“Dihydrate” Prayon Process or PH2

PH2

HEMI

>

DIHY

> Dihydrate

+

With three crystals: “Hemihydrate”then

“Dihydrate” then “Hemihydrate” Prayon

Process or PH3

PH3

HEMI

>

DIHY

>

HEMI

> Hemi-

hydrate

GAS SCRUBBING TOWER

Prayon Technologies processes can be divided into two groups :