8 replies to this topic

[reihane1]

Hello Everybody,

I have worked 5 years in engineering and design department on oil & gas treatment projects.Now I work in another company in proposal department.We just received tender invitation for waste water treatment detail design. for submitting the proposal we need to calculate demulsifer injection rate and I do not have any experience in this regard.

Feed and product specification are as below:

 

Feed Flow rate:596m3/hr

specific gravity:1,16

pressure:0,94barg

100-1000 mg/l oil

 

treated water specification:

<100mg/l free oil

98% removal of 4 microns and above

 

based on basic design we have two preseperator tanks and then gas floation packages and filters. Injection points are inlet of each seperator tanks.

the question is

1-how can I calculate injection rate

2-if another injection point inlet of gas floatation is necessary or not?

3-if we need to injection other chemicals in the system or not?

thank you and I am waiting for reply

 

 

[ankur2061]

reihane1,

 

Refer the attachment for Demulsifying chemicals and some ball park injection rates proposed. The best way to get demulsifier injection rates is to get the information from the demulsifier chemical manufacturer and supplier. Contact a company like NALCO who are one of the world's largest manufacurers of waste water treatment chemicals including demulsifiers.

 

Regards,

Ankur

Attached Files

•  Demulsifiers.pdf   422.34KB   62 downloads

[reihane1]

Dear ankur2061:

Thank u for your reply and the attached document. You are right ,in next stage we will contact chemical supplier, but because we are in proposal stage we just need a preliminary figure. I just found 3-4 ppm in one of our documents.Do u THINK that is enough?

Thank you

[ankur2061]

reihane1,

 

Read the last paragraph of the 1st page of the attachement. The answer is there.

 

Regards,

Ankur.

[sandy38813]

Dear Ankur,

Have any book/study material on "Chemical used in petroleum industry/oil and gas industry" which can cover following points,
1) Basic principle of working of individual chemical.
2) Mechanism involve during the reaction with different chemical like with antifoam, anti scale etc.
3) Composition of different chemical which used in petroleum industry

If you have any file can you share with me? and if you wish you can send me - sandy38813@gmail.com

Thanking You,

Best Regards,
Sandeep S

[ankur2061]

Sandeep,

 

Additive formulations for anti-foam, anti-scale, H2S scavengers, demulsifiers etc. are proprietary know how of companies involved in manufacturing of chemicals which sometimes are classified as "specialty chemicals". These are basically formulations where various pure chemicals are mixed in different proportions to get the desired product. Manufacturers guard these formulations fiercely and do not disclose it to anybody. In fact they are sold to customers with trade names and the chemical composition is also vaguely or incompletely described in the MSDS (Material Safety Datasheet) of these formulations. The manufacturers have their own R&D facilities to test these formulations for use as additives. The general chemistry is somewhat known but the specific reactions and the active ingredients are not disclosed by the manufacturers.

 

I do not know of any such book which provides in-depth details of the mechanism of reaction of these specialty chemicals used as additives in the oil and gas industry. Good luck to you in finding this as an open literature. There might be some scattered research papers available on the internet describing the mechanism of these additives, if you can find them.

 

If I have to buy a specialty chemical as an additive, I would ask the manufacturer to give performance guarantees rather than trying to figure out its reaction mechanism. It is just not worth the effort.

 

Hope this helps.

 

Regards,

Ankur.

[Paulo Edson Silva Junior]

Hi, I have some expertise with chemical products in oil and gas. To remove oil from water you must use a polyelectrolite (polymemer). A desmulsifier ins not soluble in water and should be use to remove water from oil.

 

Regards. Paulo

[sandy38813]

Dear All,
 
We are having early production facility, As we are involve to process heavy crude oil, regarding this process we need demulsifier and another chemicals. So we are looking for demulsifier and another chemicals supplier ( We are planing to setup a blending plant ) in Kuwait. Have you any information for the same?.

I look forward to listen from your end.

 

Thanking You,

 Regards,

Sandeep S

[sandy38813]

Dear Paulo,

 

Can you send me related files for the same.

 

Thanks,

 

Regards,

Sandeep S