RO chemicals for refineries in Pakistan — antiscalant, biocide, dechlorination

Programme outline, dosing range, feed points, target parameters, and lead times for the AAS ro chemicals for refineries in pakistan into the refineries segment in Pakistan. Sole Pakistan agent for Shaanxi Ande Technology (China) and Innovative Water Technology (Pakistan). Karachi office, same-business-day technical response.

Same-day Karachi visit · CoA per drum · Engineering autopsy on request

Field note Refineries · RO Chemicals for Refineries in Pakistan

UN-307 is on programme at a Mahmood Kot refining-sector RO train at 4 ppm on a feed LSI +2.3 / silica 42 mg/L; first-year silica fouling reduced 70% versus previous chemistry.

Programme spec

Dosing programme outline

Programme outline below is the AAS default for refineries applications. Final dose is set against the customer's source-water analysis, equipment metallurgy, and operating cycles. Every drum ships with a Certificate of Analysis; SDS is shipped pre-shipment for HSE-document review.

Antiscalant: UN-307 phosphonate-blend, 2–5 ppm on RO feed, 40–50% active
RO biocide: UN-611 non-oxidising, shock 25–75 ppm × 30–60 min weekly
Dechlorination: Sodium metabisulphite (SMBS) metered against inline ORP
Feedwater LSI tolerance: Concentrate-side LSI ≤ +2.5
Silica saturation tolerance: ≤ 100 ppm reactive at concentrate
Membrane compatibility: Polyamide TFC (Dow, Hydranautics, Toray)
Refinery feedwater validated: PARCO / PRL / ARL / NRL groundwater + KW&SB blends
Documentation: COA per drum, MSDS pre-shipment, IQ/OQ-aligned
Lead time: Ex-Karachi stock on UN-307 and UN-611

Why this matters in refineries

Why generic RO chemistry fails on a refinery process-water train

Pakistani refinery RO trains carry the heaviest scaling and fouling load in industrial water treatment: groundwater blends from Mahmood Kot or Korangi push silica into the 25–40 ppm reactive range, CaSO₄ saturation runs high on Sindh-derived makeup, barium turns up sporadically from upstream additive injection, and the upstream multi-media filters never get the suspended-solids load right on KW&SB-blend feedwater. A phosphonate antiscalant designed for IPP brackish water under-performs on silica and barium specifically. The right RO chemistry programme for a refinery is sized against a current feedwater analysis — LSI, S&DSI, silica, iron, manganese, residual chlorine — and dosed at the specific feed point that protects the membrane from the dominant scale risk.

What ships in an RO chemicals programme for a Pakistani refinery

The standard programme is two SKUs: UN-307 antiscalant on the RO feed before the cartridge filter, and UN-611 biocide as a weekly shock through the CIP loop. UN-307 is a phosphonate blend with a polymeric dispersant component that holds silica supersaturation at the concentrate side — the failure mode on PARCO / Byco-style refinery RO feeds. UN-611 is a polyamide-compatible non-oxidising biocide that controls biofilm without degrading the membrane active layer. Dose ranges: UN-307 at 2–5 ppm on feed (chemistry team sets dose against a current S&DSI on the concentrate); UN-611 shock 25–75 ppm for 30–60 minutes, 1–3× weekly depending on biofouling pressure; UN-611 offline preservation at 500–1000 ppm during long shutdowns.

Karachi stock + supply continuity for refinery operators

PARCO, PRL, ARL, and NRL operators all run on a same-week refill window — a stock-out on UN-307 means a scaling event on the next CIP cycle. AAS holds UN-307 and UN-611 ex-Karachi for same-week dispatch on drum quantities; factory-direct bulk replenishment from Shaanxi Ande lands CIF Karachi in 21–35 days for contracted multi-year volume. PKR invoicing is available to offload FX risk on multi-year supply contracts. COA ships per drum, MSDS pre-shipment for HSE document review.

Engineering support: feedwater audit, autopsy, CIP planning

Drum supply alone does not protect an RO membrane. The AAS programme bundles a feedwater audit (full ionic workup plus scaling-index calculation on feed and projected concentrate), an applications-engineering call to set the antiscalant dose against the actual feed, quarterly retest as feedwater drifts, and a 12-month membrane autopsy on a representative pressure-vessel coupon. The pattern matches what Nalco and Solenis deliver on global refinery programmes — at a corridor-cost structure that brings the line item back into the procurement budget.

Where the Refinery Process Water Program sits in the AAS catalogue

RO chemicals are one wedge of the broader Refinery Process Water Program at /programs/refinery-process/. The programme also covers cooling-water chemistry (AD-303 corrosion inhibitor + biocide rotation), boiler-water chemistry on auxiliary boilers, and the engineering support that ties the chemistry SKUs together. Refinery buyers usually start with one chemistry line — RO is the most common entry — and expand to the bundled programme over the first 18 months.

Procurement FAQ

Questions procurement teams ask first.

Which RO chemicals are compatible with my polyamide TFC membranes?

UN-307 antiscalant is compatible with all polyamide TFC, CPA, and ESPA membrane families (Dow FilmTec, Hydranautics, Toray, Suez). UN-611 biocide is specifically formulated for polyamide — chlorine and oxidising biocides destroy polyamide active layers and must never be dosed into an RO train without prior dechlorination.

What is the recommended antiscalant dose for a Pakistani refinery RO feed?

Starting dose is 3 ppm of UN-307 (40–50% active phosphonate) on feed. Final dose is set against the LSI, CaSO₄ saturation, and silica concentration at the projected concentrate side of the train. AAS supplies a feedwater audit free with the first programme order to set the dose against the actual feedwater chemistry, not a generic recipe.

How does UN-307 compare with Nalco PermaTreat or Genesys LF?

UN-307 sits in the same phosphonate-blend chemistry class. The differentiation is in the polymeric dispersant load — UN-307 is engineered for high-silica refinery feedwater, which is the dominant failure mode on PARCO and Byco RO trains. Head-to-head autopsy data after 12 months on programme is available under NDA.

Can AAS handle CIP planning and execution support?

Yes. The Refinery Process Water Program includes CIP chemistry recommendation, dose calculation, and an applications engineer on-site for the first CIP cycle after programme commissioning. Subsequent CIPs are customer-run with AAS chemistry oversight on call.

Where can I see a customer-validated case study?

UN-307 has been on programme at a refining-sector RO train in Mahmood Kot — first-year silica fouling reduced 70% versus previous chemistry. The case study is at /applications/un-307-ro-refining-mahmood-kot/.

Related material

Read deeper into the programme.

Procurement & engineering enquiry

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Send the unit you're trying to protect (site, loop or train, symptom or KPI, volume, deadline) plus a source-water analysis if you have one. Same-business-day Karachi reply with a programme outline, dose range, and the relevant CoAs / SDS attached.

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Karachi office · Sole Pakistan agent · Shaanxi Ande & Innovative Water