▼  Industry Background
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Petrochemical and refining units operate under extreme conditions—temperatures ranging from ambient to 500°C, pressures from atmospheric to 20 MPa, and media spanning crude oil to concentrated sulfuric acid and sodium hydroxide. Auxiliary systems—online sampling, additive injection, desulfurization solvent circulation, acid-alkali neutralization, FCC catalyst replenishment, and overhead corrosion inhibitor injection—constitute the triple bottom line of unit safety, product quality, and environmental emissions. Transfer pumps in these processes face unique challenges: alternating acid-alkali corrosion, ppm-level dosing accuracy, high-temperature and high-pressure sealing, and 8,000+ hours/year of continuous operation. The following analyzes the core pain points and JONSN solutions.

▼  Industry Pain Points
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▎Online Sampling Representativeness Distortion — Dead Volume, Vaporization, Residual Cross-Contamination
Online sampling systems in petrochemical units require full-process sampling from high temperatures (400–500°C at FCC reactor outlets) to low temperatures (overhead reflux condensate). Conventional sampling pumps exhibit clear deficiencies: dead volume >50 ml causes sample dilution by previous batch residues; dissolved gases in hydrocarbons vaporize within the pump chamber, causing sampling volume deviations >5%; cross-contamination when switching sampling points renders total sulfur/nitrogen analysis inaccurate. A single sampling distortion can directly cause a batch of gasoline/diesel to exceed sulfur content specifications.

▎Additive Injection — Antioxidants, Corrosion Inhibitors, Demulsifiers; ppm-Level Metering Is Margin
Refining units consume thousands of tons of additives annually: antioxidants (anti-gum deposition), demulsifiers (crude oil desalting), corrosion inhibitors (overhead corrosion protection), and antifoaming agents (delayed coker flooding prevention). Dosing deviation exceeding ±2% leads to two consequences: too little results in coking/corrosion/deposition in the unit, while too much wastes millions of yuan annually in dosing costs, and overdosing may introduce new side-reaction products.

▎Desulfurization Solvent Circulation — Amine Solution High Viscosity, Corrosivity, Foam Entrainment
Alkanolamine solutions (MDEA/DEA) used in hydrotreating, sulfur recovery, and dry gas desulfurization have viscosities of 20–80 mPa·s, with rich solution circulation rates reaching tens of tons per hour. Conventional centrifugal pumps suffer severe cavitation/gas binding in amine solutions, and trace H₂S carried in the amine causes sulfide stress corrosion cracking in ordinary metal pump bodies. Amine solutions cost ¥15,000–25,000/ton; pump seal leakage directly results in both environmental and economic losses.

▎Acid-Alkali Neutralization — Bidirectional Corrosion from Concentrated H₂SO₄ and Concentrated NaOH
In alkylation/sulfuric acid alkylation units, concentrated sulfuric acid (93%–98%) and concentrated sodium hydroxide solution (30%–50%) serve as catalysts and neutralizers. These media are injected alternately on the same line—acid wash immediately followed by alkaline neutralization. Ordinary stainless steel pumps suffer stress corrosion cracking in alkaline conditions and crevice corrosion in acidic conditions; pump body life may be only 3–6 months. Pump failure leads to uncontrolled neutralization, exposing downstream equipment to severe corrosion risk.

▎FCC Catalyst Replenishment — High-Temperature Powder Wear; Uneven Flow Causes Bed Channeling
Fluid catalytic cracking (FCC) units replenish several tons of catalyst powder (temperature 650–720°C) daily. Powder flow deviations directly cause uneven catalyst distribution in the riser—local insufficient catalyst concentration produces thermal cracking (reduced liquid yield), while local excess produces dry gas + coke (deteriorated product distribution). Pumps conveying powder must also withstand abrasive wear from catalyst particles.

▎Overhead Corrosion Inhibitor Injection — High Pressure, Trace Volume, Continuous and Uninterrupted
Corrosion inhibitors injected at atmospheric/vacuum tower overheads form protective films in the condensation system. Injection rates are typically only 5–20 ppm (relative to crude throughput) but must be delivered stably against 0.2–2.0 MPa backpressure at the tower overhead. A 2-hour injection interruption can cause sulfide corrosion perforation of overhead condensers, with shutdown repairs costing millions. Conventional metering pumps experience significant flow decay under high backpressure and require frequent calibration.

▼  JONSN Solution: Six Processes — Corrosion Resistance, High Precision, High Reliability Trifecta
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▎Online Sampling — MPG Minimal Dead Volume, Rapid Flushing, Zero Cross-Contamination
MPG Series (40 μl/r, 1–280 ml/min) provides the optimal choice for petrochemical online sampling with extremely small dead volume and rapid response:

· Dead volume <0.5 ml, sample displacement complete with <2 ml flush volume, residual cross-contamination <0.1%
· Positive displacement principle ensures sampling volume varies only with speed; vaporization does not affect metering
· Configurable multi-channel switching valve enables a single sampling pump to serve 6–12 sampling points
· Nanolitre-level sample volume sufficient for GC/MS/elemental analysis requirements, eliminating additional sample processing
· 316L/PEEK flow path fully inert to gasoline/diesel/steam cracking gas

Recommended: MPG Series (40 μl/r) + multi-channel switching valve, single pump serving multiple sampling points

▎Additive Injection — MPG/MRA Multi-Channel ppm-Level Precision Proportioning
MPG and MRA series combined provide full-range coverage for additive injection:

· MPG (1–280 ml/min) handles trace additives (demulsifiers, antifoam agents, corrosion inhibitors), metering deviation <±1%
· MRA (100–2000 ml/min) handles medium-flow additives (antioxidants, anti-coking agents), metering deviation <±0.5%
· Servo motor independent drive; each additive independently pumped; one-touch formula switching
· Positive displacement viscosity immunity: additive viscosity fluctuation within 1–200 mPa·s range, flow does not drift
· Hastelloy C-276/Titanium pump head options for sulfur/chlorine-containing additive corrosivity

Recommended: MPG (1–280 ml/min) × N channels + MRA (100–2000 ml/min) × M channels, PLC synchronized control

▎Desulfurization Solvent Circulation — DP High Viscosity, Corrosion Resistant, Magnetic Seal Zero Leakage
DP Series (0.2–100 cc/r) designed for the high-viscosity, corrosive, zero-leakage characteristics of amine desulfurization:

· Capable of delivering viscosities up to 50,000 mPa·s, covering the full viscosity range of MDEA/DEA/sulfur solvents
· Magnetic drive eliminates dynamic seals; zero leakage even with H₂S present in the amine solution—preventing personal safety and environmental incidents
· 316L/duplex stainless steel pump head options, resistant to wet H₂S stress corrosion cracking
· Low-shear design, amine solution produces no foam entrainment, maintaining desulfurization efficiency
· Optional jacketed insulation to maintain optimum amine desulfurization temperature of 40–60°C

Recommended: DP Series (0.2–100 cc/r), 316L/duplex steel pump head, magnetic seal

▎Acid-Alkali Neutralization Metering — MRA Hastelloy Full Corrosion Solution
MRA Series (100–2000 ml/min) provides bidirectional corrosion protection for acid-alkali neutralization:

· Hastelloy C-276 pump head simultaneously withstands concentrated H₂SO₄ (pH <0) and concentrated NaOH (pH >14)
· Positive displacement metering ensures neutralizer addition precisely matches acid value, deviation <±1%
· Magnetic drive eliminates dynamic seals, preventing concentrated acid/alkali leakage and personal injury incidents
· PTFE/PEEK seals chemically inert to sulfuric acid and sodium hydroxide; no swelling, no embrittlement
· Configurable pH online feedback closed-loop control for automated neutralization

Recommended: MRA Series (100–2000 ml/min), Hastelloy C-276 pump head

▎FCC Replenishment Delivery — DP High-Temperature Powder Wear-Resistant Solution
DP Series provides high-temperature, wear-resistant powder conveying capability for FCC catalyst replenishment:

· Nitrided hardened gears with hardness HV 1000+, resistant to catalyst particle abrasion, design life >15,000 h
· Large gear clearance design accommodates fine powder particles, no jamming, no scoring
· Capable of delivering powder slurries with solids content up to 40%–60%
· Optional jacketed insulation/heating (up to 260°C), matching high-temperature conditions
· Low-shear delivery preserves catalyst particle shape; no crushing, no classification

Recommended: DP Series (0.2–100 cc/r), nitrided hardened gears, jacketed insulation

▎Overhead Corrosion Inhibitor Injection — MPG High Backpressure Trace Stable Injection
MPG Series provides reliable protection for tower overhead corrosion inhibition with microliter-level metering and high backpressure adaptability:

· Backpressure tolerance up to 5.0 MPa; flow decay <1% at 2.0 MPa
· Trace injection accuracy: 5–20 ppm metering deviation <±0.5% (relative to setpoint)
· Servo motor closed-loop control with real-time flow signal feedback regulation
· Magnetic drive eliminates dynamic seals; zero leakage in flammable/explosive tower overhead zones
· Configurable dual-pump redundancy; automatic switchover to backup pump in <1 second upon primary pump failure, ensuring uninterrupted injection

Recommended: MPG Series (40 μl/r), high-pressure type 5.0 MPa, dual-pump redundant configuration

▼  Product Selection Quick Reference
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▼  Safety and Explosion-Proof Compatibility
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· Full-series magnetic drive eliminates dynamic seals, meeting API 682 zero-leakage requirements; ATEX/IECEx explosion-proof certification available for flammable media applications

· 316L/Hastelloy C-276/Duplex Stainless Steel/Titanium pump head options covering all corrosion scenarios

· PTFE/FFKM/PEEK wetted flow path seals resistant to wet H₂S, concentrated sulfuric acid, amine solutions, and aromatic hydrocarbon solvents

· Dual-pump redundant configuration supports seamless switchover (switchover time <1 second); critical process injection never interrupted

· NAMUR sensor interface available, compatible with DCS/SIS control systems

· Magnetic coupling withstands transient overload; overpressure protection without additional safety valves

· Design life >20,000 hours, matching the 3–5 year turnaround cycle of refining units

· Operating temperature range −20°C to 260°C, covering the full temperature range from tower overhead reflux condensation to FCC high-temperature replenishment

▼  Core Values
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▸ Sampling Representativeness — Dead Volume <0.5 ml, Every Sulfur Analysis Is Trustworthy

Online sampling in petrochemical units is the first line of quality control. The MPG minimal dead volume design ensures every sample reflects real-time actual operating conditions, eliminating residual dilution and vaporization errors. Multi-channel switching allows one MPG to replace 6–12 independent sampling pumps.

▸ Additive Precision — Saving Millions in Annual Dosing Costs While Making the Unit Safer

Additive injection deviation is compressed from ±3–5% of conventional metering pumps to ±0.5–1%. A one-million-ton refining unit can save millions of yuan annually in additive costs. More importantly, positive displacement viscosity immunity ensures dosing quantities do not drift with operating condition fluctuations.

▸ Zero Amine Leakage — Magnetic Seal Eliminates H₂S Leakage Risk

MDEA/DEA amine circulation rates reach tens of tons per hour, valued at tens of thousands of yuan per ton, and carry toxic H₂S. The significance of DP magnetic drive without dynamic seals extends beyond saving solvent losses to fundamentally eliminating potential risks of personal injury and environmental incidents.

▸ Acid and Alkali Mastery — Hastelloy C-276, One Pump Simultaneously Withstands pH <0 and pH >14

In alkylation/sulfuric acid alkylation units, concentrated sulfuric acid and concentrated alkali are injected alternately on the same line. The MRA + C-276 combination enables a single pump to handle both acid and alkali injection tasks, eliminating the complexity and leakage risk of dual-pump switching.

▸ Uninterrupted FCC Replenishment — Nitrided Hardened Gears Against Catalyst Abrasion

FCC units replenish several tons of catalyst powder daily; conventional progressive cavity/gear pumps wear rapidly. DP nitrided hardened gears + large clearance design maintain stable flow and long life in powder flow.

▸ Uninterrupted Overhead Injection — Dual-Pump Redundancy Switchover <1 Second

A 2-hour interruption of overhead corrosion inhibitor injection can cause condenser perforation. MPG high-pressure type + dual-pump redundant configuration ensures injection is never interrupted, with primary/backup switchover <1 second and 8,000+ hours of continuous non-stop operation.