Surfactant blends for cleaning filtration membranes
The present invention relates to the field of membrane separation processes and clean in place compositions for cleaning such membranes. The cleaning compositions can remove proteins, fats, and other food, beverage, and brewery based soils and offer an environmentally friendly alternative surfactant system to NPE. According to the invention, surfactants and polymers useful for this process are unpredictable and specific surfactants, polymers, and combinations of the same are disclosed for use alone, as part of a cleaning composition. Methods of use of the same are also included.
1. A method for cleaning a membrane filter system comprising:
washing said membrane with a composition comprising a surfactant booster comprising at least three or more of the following surfactants, nonionic polymers, surfactant blends, or surfactant/nonionic polymer blends:
PEG 1450/hexyl glucoside blend (50/50); hexyl glucoside; PEG 1450; a lauryl dimethyl amine oxide; a C9-11 linear alcohol with 6 moles of ethoxylation; an alkoxylated Guerbet alcohol; PEG 4000; polycarboxylated alcohol; PEG 1450/alkoxylated Guerbet blend (50/50); PEG 1450/hexyl glucoside (50/50); hexyl glucoside/alkoxylated Guerbet blend (50/50); PEG 1450/C9-C11 linear alcohol with 6 moles ethoxylation blend (50/50); Guerbet XL-70; a blend of C9-C11 linear alcohol with 6 moles ethoxylation and a C9-11 linear alcohol with 8 moles ethoxylation (50/50); PEG 300; PEG 1450/hexyl glucoside/alkoxylated Guerbet blend (40/40/20); linear alkyl benzene sulfonate; C9-C11 linear alcohol with 8 moles ethoxylation; Polysorbate 20; C9-C11 linear alcohol with 6 moles ethoxylation/hexyl glucoside blend (50/50); Dioctyl sulfosuccinate; C12-C15 linear alcohol with 7 moles ethoxylation; C9-C11 linear alcohol with 6 moles ethoxylation/alkoxylated Guerbet (50/50); and Alpha olefin sulfonate; wherein said surfactant booster contains less than about 0.5% by weight nonyl phenol ethoxylate.
2. A method according to claim 1 , wherein the membrane is fouled with a food, water, beverage, or brewery product.
3. A process according to claim 1 , wherein the membrane is fouled with a dairy product.
4. The method of claim 1 wherein said composition further comprises water.
5. The method of claim 1 wherein said surfactant booster creates a contact angle of less than 30 degrees on PES membranes.
6. The method of claim 1 wherein said surfactant booster creates a contact angle of less than 35 degrees on PVDF membranes.
7. A method according to claim 1 , further comprising washing said membrane with a source of alkalinity.
8. The method of claim 7 wherein said washing occurs prior to, simultaneous with or after said surfactant booster wash step.