[fash]

HI,

I would appreciate any assistance in designing a reactor to formulate Chromated Copper Arsenate CCA Type C Wood Preservative.
Here is what i know so far and have attached a preliminary reactor design. I am looking to produce 5000 litres per day.
The attached drawing does not show the input for arsenic acid but it is there.
Thanks in advance.

CCA is a mixture of three inorganics, it does not have a unique chemical name, it is recognized as chromated copper arsenate.

Chemical Name: Chromated Copper Arsenate
Common/ Trade Name: CCA-C
Chemical Family: Inorganics
CAS Registry No: N/A

2. Manufacturing Processes:

Starting reagents  (RAW MATERIALS) for these ingredients are selected from:
Arsenic(V) as arsenic acid or sodium arsenate, Chromium(VI) as potassium or sodium
dichromate, Copper(II) as copper sulfate or basic copper carbonate or copper hydroxide or Cupric Oxide

FINAL PRODUCT - Chromated copper arsenate ( CCA-type C)
This mixture is prepared by the standard set by American Wood Preservatives Association ( AWPA). The active ingredients in CCA-type C are required to have the following FINAL composition:

CrO3 ( chromium in + 6 oxidation state): 47.5%

CuO ( copper in + 2 oxidation state) 18.5%

As2O5 ( arsenic in + 5 oxidation state) 34.0%

CCA-C is manufactured by a batch process. Typically, in a mixing tank chromic acid and
arsenic acid are added and slowly copper oxide is added as the addtion of copper oxide is an
exothermic process. Batch temperature is maintained around 75 o C. The duration of each step in
the batch process depends on the size of a batch. Each batch is allowed is allowed to settle in a
settling tank for 12 hours to eliminate the insoluble impurities. The final product is filtered.

[Gerard]

it is very helpful to open these kinds of books:
octave levenspeil's chemical reactor engineering
Foggler's:Chemcial reactor design