Published: November 2026 | By Fareast Engineering Team
A 100 TPD graphite hydrogen chloride synthesis unit costs $600,000 to $900,000 FOB China in 2026 — equipment only. Add civil works, acid storage, utilities and installation, and the installed figure lands at $1.0–1.3 million.
Search how much does a 100 tpd hydrochloric acid synthesis unit cost and you will find two numbers: a marketplace listing at $640,000, and analyst ranges of “$600k–900k+”. Neither tells you what the money buys. That is why two quotations for identical capacity can sit $300,000 apart and both be honest.
The percentages below come from actual bills of material, not from a report. Fareast has built graphite synthesis units at its Nantong works since 1996, first as a pressure vessel fabricator and now as a China manufacturer holding an A4 non-metallic vessel licence. Here is where the money goes, block by block.
What Are the Four Cost Blocks Inside a 100 TPD Unit?
Four blocks absorb almost the entire price: the synthesis core takes 36%, cooling and absorption 28%, steam recovery 18%, and automation plus documentation 18%. At a $750,000 mid-point, that is roughly $270,000, $210,000, $135,000 and $135,000.
1. Synthesis core — 36%, about $270,000
The impregnated graphite combustion chamber, mixing burner, ignition system, sight ports and the steel shell with spring compensation. Two variables set the cost: graphite block volume and impregnation grade. The design ceiling is a 220°C wall temperature — ask for anything above that and you are buying a different material, not a bigger furnace.
2. Cooling, absorption and tail gas — 28%, about $210,000
A falling-film absorber, acid cooler, tail gas scrubber and circulation pumps. Two choices dominate this block: 31% or 38% acid, and whether your downstream process needs dry HCl gas instead of liquid acid. A dry-gas requirement deletes the absorber but adds drying or refrigeration — rarely a saving.
3. Steam recovery — 18%, about $135,000
Steam drum, evaporator section, boiler feed pump, pressure control and blowdown. Pressure is the cost lever: 0.3 MPa sits inside a modest shell, while 0.8 MPa needs thicker graphite and a heavier vessel class. This is also the only block that pays for itself. Published figures range from 0.65 to 0.9 tonnes of steam per tonne of HCl; even at a conservative 0.7, the package returns its cost in under two years.
4. Automation, testing and documentation — 18%, about $135,000
DCS, the safety interlocks (H2/Cl2 ratio, flame failure, quench water, pressure), gas analysers, factory acceptance test, hydro and helium leak tests, material certificates and the vessel file your inspector signs. A SIL-2 loop and third-party witnessed testing are the two items buyers cut most often — and the two that decide whether the unit passes commissioning.
What the $600,000 does not buy
A battery-limit quotation excludes more than most first-time buyers expect. Budget a further $250,000–450,000 for:
• Civil foundations and structural steel for a 12–15 m vessel
• Acid storage: two rubber-lined or FRP tanks of 100 m³, $60,000–120,000
• H2 and Cl2 headers, buffer volume and emergency shut-off valves
• Cooling tower or chiller, MCC and electrical room
• Sea freight, insurance, unloading and rigging
• Installation, insulation and commissioning utilities
• First fill of spares: burner, rupture discs, gaskets, graphite coupons
This is where budgets break. Once storage, utilities and installation are counted, HCl synthesis unit capital cost per ton per day capacity rises by 35–45% against the equipment price — the single most common reason a project is approved at $700,000 and needs $1.1 million.
✅ Bottom line: Of a $750,000 price, about $480,000 buys graphite and steel, $135,000 buys the steam loop, and $135,000 buys the paperwork that makes the unit legal to run.
How Does the Price per Daily Tonne Change From 50 to 150 TPD?
It falls steeply: about $9,600 per daily tonne at 50 TPD, $7,500 at 100 TPD and $6,300 at 150 TPD. That is why HCl synthesis unit capital cost per ton per day capacity is a fairer comparison than total price.
• 50 TPD — $430,000–580,000 — $8,600–11,600 per daily tonne — about 160 t/d of 31% acid
• 100 TPD — $600,000–900,000 — $6,000–9,000 per daily tonne — about 320 t/d of 31% acid
• 150 TPD — $820,000–1.15 million — $5,500–7,700 per daily tonne — about 480 t/d of 31% acid
The reason is simple. Shell, DCS, engineering hours and the certification file are nearly fixed; only graphite volume scales. Tripling capacity costs about double — which is why stepping up one size is usually cheaper than adding a second unit three years later.
Four specification choices move a quote by 30% at identical capacity:
• Two-in-one, three-in-one or four-in-one. Each step adds a section. Four-in-one deletes the separate tail gas absorber but adds integration work — net 10–15% higher.
• 31% or 38% acid. Higher strength needs tighter absorption, more cooling area and a better resin.
• Steam at 0.3 or 0.8 MPa. The high tier changes the vessel class, not just the drum.
• Impregnation. Phenolic, furan or PTFE; PTFE for oxidising or chlorine-dry duty adds 8–12% to graphite cost.
For a smaller project, the hydrochloric acid plant capex 50 tpd turnkey price is the number to anchor on: $560,000–810,000 installed, against $430,000–580,000 for equipment alone. That gap — not the headline price — is what separates a supplier quotation from a project budget.
It is also the honest way to answer how much does a 100 tpd hydrochloric acid synthesis unit cost when the alternative is two 50 TPD lines. Two small units cost about 40% more than one large one, and need twice the operators. A graphite HCl synthesis unit is a pressure system with a steam loop attached; quote it as one.
✅ Bottom line: Compare quotes on dollars per daily tonne and on scope — an $820,000 unit at 150 TPD is cheaper per tonne than a $430,000 unit at 50 TPD.
Frequently Asked Questions
Q: Does “100 TPD” mean 100 tonnes of HCl gas, or 100 tonnes of 31% acid?
A: It should mean 100 tonnes per day of 100% HCl, which becomes roughly 320 t/d of 31% acid or 260 t/d of 38% acid. If a supplier's “100 TPD” refers to finished 31% acid, the unit is about one third the size and should cost around 40% less. Confirm it on the datasheet before comparing anything — this one ambiguity explains most of the spread you see when asking how much does a 100 tpd hydrochloric acid synthesis unit cost across three vendors.
Q: What is the lead time, and what happens after delivery?
A: Four to six months of manufacturing for a 100 TPD unit, including a witnessed factory acceptance test. Add four to six weeks of sea freight, three to four weeks of installation supervision and about two weeks of commissioning. Plan the hydrochloric acid plant capex 50 tpd turnkey price conversation around that calendar, not around the equipment price alone — every week of delay costs more than the difference between two competent bidders.
Q: Can a Chinese factory supply a turnkey unit with international documentation?
A: Yes, if the factory holds the licence. Nantong Fareast Chemical Equipment Co., Ltd. has held an A4 non-metallic pressure vessel manufacturing licence since 2023, has been ISO 9001 certified since 2007, and took part in drafting two national standards for impermeable graphite equipment that take effect in July 2026. Fareast provides the design package, third-party inspection by TÜV, SGS or BV, and English documentation. Custom OEM configurations and multi-unit orders are quoted from the same works.
Send your capacity, acid concentration, steam pressure and battery-limit drawing to Fareast, and you receive a line-item budgetary quotation within five working days — split into the same four blocks used above, with the exclusion list attached. No charge, no obligation. Factory-direct pricing for OEM and custom scopes, and reference projects in Russia and Europe available on request.
www.fe-graphite.com
Nantong Fareast Chemical Equipment Co. LTD
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