Cosun Biobased Products is part of Royal Cosun

Aqueous use of membrane systems - Carboxyline

CMI is a green threshold inhibitor, with NSF-certification for use in potable water, effective against CO3 and SO4–scale. Due to its inherent biodegradability the product offers the unique feature of being biobased but not contributing to biofouling. This also holds true at long induction times.

In membrane processes such as Reverse Osmosis (RO) and Nano-Filtration (NF) scaling can occur when
the solubility limits of salts are exceeded. As a result, salts can precipitate on the membrane surface
leading to reduced yield and higher energy cost. The use of an antiscalant increases the threshold limit for scaling and therefore the recovery rates can be increased. The antiscalants currently used in potable water membrane processes are designed for functionality and stability under process conditions, however many have environmental concerns.

Full-scale operation of CMI delivered the following benefits:
• Effective scale inhibition at low dosing levels
• Prolonged induction time
• No contribution to biofouling
• Less cleaning required & less downtime
• Lower energy consumption
• Cartridge lifetime enhancement
• No compromise on recovery

• Potable water production: BWRO, SWRO, etc.
• Sulfate removal systems
• Vacuum membrane distillation
• Injection water, produced water, etc

Available Products*
 Product   CMI [wt%]  Remarks
Carboxyline 25-30 UP 30 ultra purified
Carboxyline 25-40 UP 40 ultra purified
 *Selection only; more grades available.

Biofouling potential
CMI is inherently biodegradable and has a very slow initial degradation phase (hydrolysis). In contrary to readily biodegradable antiscalants, this unique property of CMI allows biodegradability of the antiscalant without contributing to biofouling by the molecule itself. For the application of CMI in RO/NF systems an ultra purified (UP) grade was developed.

• NSF Standard 60